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830 FRESH-WATER AI.QM OF HAMPSHIRE.
D. Ehrenhcrgii Ealfs. E. P. M.
— /3. grcnnilatum Ealfs. E.
D. clavatum Kg. E. W.
D. truncatum Breb. E. M.
Z>. rectum Delp. E. P.
Closterium didymotocum Corda. E
C. Baileyanum Ealfs. E.
C. obtusum Breb. E.
C. Liinula Ebr. E.
6\ Ehrenbergii Menegb. H.
C. monilifcrum Ebr. H.
C. acerosum Scbr. E. E.
C. antiacerusum De Not. E.
C. macUentiun Breb. E.
C. striijosum Breb. E.
C. Lundellii Lagerb. E.
C. qracile Breb. E.
C. 'Leihleinii Kg. E. W. M. E. H.
C. calosponim Wittr. E.
C. Diana Ebr. E.
C. Venus Kg. E. W.
C. incurvum Breb. E.
C. arcuatum Breb. E.
C. Lagoense Nordst. E.
C. stiiolatum Ebr. W.
C. STEioLATUM /3. ORTHONOTUM, n.var. E. p. W. Upper side flat,
straigbt for about balf tbe lengtli of tbe frond ; eleven to twelve times
longer than broad; from one-sixth to one-fourth longer than tbe
typical form, by two-thirds of its breadth ; in colour and striation tbe
two are similar ; zygospore unknown. Length, 320-390 // ; breadth,
32 /a; do. at apex, 8-10 /a. If nothing more, this is at least a very
distinct as well as a common var. It maintains its characteristics,
with very slight variation, in such widely separated regions as South
Africa and New Zealand. Mr. Archer considers it a good species,
and probably he is right. I prefer in the meantime to put it as a
var. till the zygospore and mode of conjugation are known. The
conjugation of the typical (regularly curved) form is quite the same
in South Africa as here. It is very well represented by Ealfs
(' Brit. Desmid.' tab. xxix. fig. 2g). Ehrenberg gives a figure of
the conjugation (' Infus.' Taf. vi. fig. xii. 6), which differs so much
from that of Ealfs that it is very doubtful if both bad tbe same
species in view. Ealfs' fig. 2/i is evidently something quite different
from his 2^. Neither of these represents the new var., but 2 6 and
2/, though not very characteristic, seem to belong to it. His other
figs., 2rt, 2d, 2e, and 2g, undoubtedly represent the striolatum of
Ehrenberg {i.e., figs. 1-5); his figs, c and h are doubtful.
' C. MalinvernicumT)Q^oi. W. P. Digitus 'E\\v. E.
C. intermedium Ealfs. E.
C. juncidum. Ealfs. — /i. brevior
(forma brevior et rubustiur Eabenh.).
E.
C. attenuatum Ebr. E.
C. linentum Ebr. E.
E
C. rostratiim Ebr.
(J. Kutzivgii Breb.
C. setaceum Ebr.
C. priimun Breb.
C curnn Ebr. E.
C. ceratium Perty. E. W.
C. acutum Breb. E. H.
C. linru Perty. E. P.
Pe'iiium murijaritaccuin Breb. E.