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192 ZYGNEMATACEAE chromatophores, making .i to i turn; conjugation scalariform; tubes formed by both gametangia; fertile cells shortened and inflated; zygospores lenticular, 60-90M x 48-60/1; median spore wall brown, irreg- ularly pitted. (PI. XXXI, Figs. 17-1S.) United States: Missouri to Massachusetts and Florida. Europe; Australia; South Africa. 162. Spirogyra moebii Transeau 1934. Trans. Amer. Micros. Soc. 53, p. 225. S. maxima var. minor Mocbius. Flora. 75, p. 421. 1892. Vegetative cells So-iiy ix x 130-240 /.i, with plane end walls; 6 to 8 chromatophores, making .5 to i turn; conjugation scalariform; tubes formed by both gametangia; fertile cells cylindric; zygospores lenticular, 74-100 /x X 56-65 ju; median spore wall yellow-brown, reticulate. United States: Oklahoma (Taft Coll.). Europe; Australia, Queensland. 163. Spirogyra oblata Jao 1936. Amer. Jour. Bot. 23, p. 58, Figs. 29-31. Vegetative cells 96-11 m x 80-256/', with plane end walls; 9 to 13 chromatophores, nearly straight, or making up to .6 turn; conjugation scalariform; tubes formed by both gametangia; fertile cells shortened, cylindric; zygospores lenticular, 93-106A1 x 64-70/
SPIROGYRA 193 by both gametangia; fertile cells cylindric; zygospores lenticular to compressed-ovoid, 102-126 i-t x 140-154 /a x 72-97 a^; median spore wall brown, smooth. (PL XXXII, Fig. 5.) Russia, Bessarabia. 166. Spirocyra azygospora Singh 1938. Jour. Indian Bot. Soc. 17, p. 372. Vegetative cells 85-90 a^ x 270-300^1, with plane end walls; chromatophores 5; conjugation unknown; reproduction by aplanospores which are compressed-globose, 71-77/^ x 60-67 /x; rnedian wall thick, brown, and smooth. (PL XLI, Fig. 16.) India, Gorakhpur, U.P., October, 1936. Fig. F.—Vegetative cell of Spirogyra crassa. The average length is usually about the same as the diameter, and conjugating filaments always have some cells about one-half the diameter. This cell has 8 chromatophores. 167. Spirogyra crassa Kiitzing 1843. Phycologia Generalis, p. 280, PL 14, Fig. 4. Vegetative cells 140-165 /x x 126-330 /a, with plane end walls; 6-12 chromatophores, making .5 to i turn; conjugation scalariform; tubes zygospores compressed-ovoid, 120-150 /x x 140-160 a
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THE ZYGNEMATACEAE
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GRADUATE SCHOOL MONOGRAPHS Contribu
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INTRODUCTION The absence of a moder
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INTRODUCTION ix Illinois State Teac
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Plat€ ILLUSTRATIONS Plates Page I
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THE ZYGNEMATACEAE
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4 ZYGNEMATACEAE gametes is by means
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6 ZYGNEMATACEAE are common but are
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8 ZYGNEMATACEAE between cells, the
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10 ZYGNEMATACEAE sporiferous cells
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12 ZYGNEMATACEAE TABLE I Summary of
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14 ZYGNEMATACEAE In higher latitude
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i6 ZYGNEMATACEAE specimens with mat
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1 ZYGNEMATACEAE II. Spores usually
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20 ZYGNEMATACEAE 32. Diameter veget
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22 ZYGNEMATACEAE REPRODUCTION BY AP
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24 ZYGNEMATACEAE spores formed in t
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26 ZYGNEMATACEAE pitted; pits 5-6 /
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28 ZYGNEMATACEAE spores are formed
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30 ZYGNEMATACEAE spores formed in t
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32 ZYGNEMATACEAE biculate; pits 4.5
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34 ZYGNEMATACEAE United States: Ill
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36 ZYGNEMATACEAE zygospores globose
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38 ZYGNEMATACEAE spores formed in o
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40 ZYGNEMATACEAE spores in one of t
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42 ZYGNEMATACEAE an outer pectic la
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44 ZYGNEMATACEAE irregular in form
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46 ZYGNEMATACEAE cylindncum Transea
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CHAPTER THREE THE GENUS ZYGNEMOPSIS
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ZYGNEMOPSIS 51 6. Median spore wall
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ZYGNEMOPSIS 53 22-25 jLi X 25-30 /"
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ZYGNEMOPSIS 55 12. Zygnemopsis sple
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ZYGNEMOPSIS 57 23-50 Ai, with a mor
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quadrata Jao 1935 ZYGNEMOPSIS 59 si
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CHAPTER FIVE THE GENUS ZYGOGONIUM K
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ZYGOGONIUM 65 3. Zygospores 15-26/U
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ZYGOGONIUM 67 ospores ellipsoid to
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ZYGOGONIUM 69 14. Zygogonium stephe
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CHAPTER SEVEN THE GENUS MOUGEOTIOPS
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CHAPTER RIGHT THE GENUS DEBARYA WIT
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DEBARYA 77 3. Debarya ackleyana Tra
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CHAPTER NINE THE GENUS MOUGEOTIA C.
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MOUGEOTIA 8i not be cited as proof
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7. Spores globose to ovoid, variabl
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MOUGEOTIA 85 30. Spores ovoid 40-54
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MOUGEOTIA 87 52. Zygosporangia regu
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MOUGEOTIA 89 74. Spore wall smooth
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MOUGEOTIA 91 6. MouGEOTiA ELLiPsoiD
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MOUGEOTIA 93 tending somewhat into
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MOUGEOTIA 95 conjugation scalarifor
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MOUGEOTIA 97 pyrenoids; gametangia
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MOUGEOTIA 99 ous scattered pyrenoid
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MOUGEOTIA loi cylindric, with conca
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MOUGEOTIA 103 56. MouGEOTiA ATUBULO
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MOUGEOTIA 105 aplanospores occupyin
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MOUGEOTIA 107 with hornlike process
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MOUGEOTIA 109 77. MouGEOTiA viRiDis
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MOUGEOTIA III 85. MouGEOTiA QUADRAN
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MOUGEOTIA 113 94. MouGEOTiA MAYORi
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MOUGEOTIA 115 craterophora Bohlin 1
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CHAPTER TEN THE GENUS TEMNOGAMETUM
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CHAPTER ELEVEN THE GENUS SIROCLADIU
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CHAPTER THIRTEEN THE GENUS SPIROGYR
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SPIROGYRA 125 in thickness, and eac
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SPIROGYRA 127 may be widened and ne
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SPIROGYRA 129 Of the 2 species with
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SPIROGYRA 131 II. Most of the spore
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31. Diameter vegetative cells more
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SPIROGYRA 135 END WALLS PLANE (one-
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66. Spores 34-48 i". x 48-54^1 93-
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82. Median spore wall double, outer
Page 161 and 162: loi. Fertile cells cylindric, chrom
Page 163 and 164: 115. Diameter vegetative cells 130-
Page 165 and 166: SPIROGYRA 145 133. Reproducing by a
Page 167 and 168: SPIROGYRA 147 157. Median spore wal
Page 169 and 170: SPIROGYRA 149 178. Chromatophores i
Page 171 and 172: SPIROGYRA 151 3. Spirogyra juercens
Page 173 and 174: SPIROGYRA 153 China, Szechwan. The
Page 175 and 176: SPIROGYRA 155 matophore; conjugatio
Page 177 and 178: SPIROGYRA 157 23. Spirogyra affinis
Page 179 and 180: SPIROGYRA 159 cells to globose, 28-
Page 181 and 182: SPIROGYRA i6i qucntly misapplied th
Page 183 and 184: SPIROGYRA 163 scalariform; tubes fo
Page 185 and 186: SPIROGYRA 165 ellipsoid, ^P-^^i^ x
Page 187 and 188: Germany; Latvia; Yugoslavia; Finlan
Page 189 and 190: Coll.). SPIROGYRA 169 Dutch New Gui
Page 191 and 192: SPIROGYRA 171 formed by both gameta
Page 193 and 194: SPIROGYRA 173 This imperfectly desc
Page 195 and 196: SPIROGYRA 175 Vegetative cells 35-4
Page 197 and 198: SPIROGYRA 177 loi. Spirogyra polyta
Page 199 and 200: SPIROGYRA 179 formed by both gameta
Page 201 and 202: SPIROGYRA i8i is thin, brownish and
Page 203 and 204: SPIROGYRA 183 PI. 8, Figs. 87-88. A
Page 205 and 206: SPIROGYRA 185 United States: Widely
Page 207 and 208: SPIROGYRA 187 65-83 /x X 75-1 00 /x
Page 209 and 210: SPIROGYRA 189 150. Spirogyra reinha
Page 211: SPIROGYRA 191 cylindric or slightly
Page 215 and 216: SPIROGYRA 195 although the tubes be
Page 217 and 218: wall. United States: Texas, Karnac,
Page 219 and 220: SPIROGYRA 199 found the earlier sta
Page 221 and 222: SPIROGYRA 201 matophore, making 3 t
Page 223 and 224: SPIROGYRA 203 199. Spirogyra unduli
Page 225 and 226: SPIROGYRA 205 United States: Iowa;
Page 227 and 228: SPIROGYRA 207 spores ellipsoid, 20-
Page 229 and 230: SPIROGYRA 209 iform; tubes formed b
Page 231 and 232: SPIROGYRA 211 tubes formed by both
Page 233 and 234: SPIROGYRA 213 forma gracilior). Czu
Page 235 and 236: SPIROGYRA 215 244. Spirogyra gratia
Page 237 and 238: SPIROGYRA 217 252. Spirogyra incons
Page 239 and 240: SPIROGYRA 219 iform; tubes formed b
Page 241 and 242: SPIROGYRA 221 zygospores ellipsoid
Page 243 and 244: SPIROGYRA 223 274. Spirogyra verruc
Page 245 and 246: SPIROGYRA 225 elliptica Jao 1935 83
Page 247 and 248: SPIROGYRA 227 mirabilis (Hassall) K
Page 249: SPIROGYRA 229 siibsalina Cedercreut
Page 252 and 253: 232 ZYGNEMATACEAE Usually the matur
Page 254 and 255: 234 ZYGNEMATACEAE cncd and rcilexcd
Page 256 and 257: 236 ZYGNEMATACEAE Figs. H to K. Sir
Page 259 and 260: INDEX Roman numerals refer to plate
Page 261 and 262: grossii (Spirogyra), XXX, 6; 185 Ha
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punctiformis (Spirogyra), XXXIV, 5-
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PLATES
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PLATE 1 247.
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PLATE ir 249
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PLATE III 251
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PLATE IV 253
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PLATE V 255
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PLATE VI 257
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PLATE VII 259
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PLATE VIII 261
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PLATE IX 263
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PLATE X 265 '^=S
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PLATE XI 267
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PLATE XII 269
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PLATE XIII 271
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PLATE XIV 273
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PLATE XV 275
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PLATE XVI 277
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PLATE XVII 279
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PLATE XVIII 281
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PLATE XIX 283
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PLATE XX 285
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PLATE XXI 287
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PLATE XXII 289
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PLATE XXIII 291
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PLATE XXIV 293
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PLATE XXV 295
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PLATE XXVI 297
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PLATE XXVII 299
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PLATE XXVIII 301
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PLATE XXIX 303
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PLATE XXX 305
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PLATE XXXI 307
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PLATE XXXII 309
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PLATE XXXIII 311
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PLATE XXXIV 313
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PLATE XXXV 315
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PLATE XXXVI 317
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PLATE XXXVII 319
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PLATE XXXVIII 321
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PLATE XXXIX 323
Page 345 and 346:
PLATE XL 325
Page 347:
PLATE XLI 327
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