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wall.
United States: Texas, Karnac, April 27, 1938.
SPIROGYRA 197
In this collection the outer spore wall was much larger than the median
179. Spirogyra taylorii Jao 1935. Trans. Amer. Micros. Soc. 54,
p. 4, PL I, Figs. 2-3.
Vegetative cells 12-16(1 x (48-) 70-193 ju,, with plane end walls; i
chromatophore, making 2.5 to 6 turns in the cell; conjugation scalar-
iform; tubes formed by the male gametangia; fertile cells inflated
toward the middle and usually more on the conjugating side, up to
33 /-i; zygospores ellipsoid, 19-29;". x 39-45 /x; median spore wall finely
reticulate to punctate, yellowish-brown at maturity. (PI. XXXIII,
Fig- 9-)
United States: Massachusetts, Woods Hole.
The fertile cells are continuous in the filaments, not separated as in the
next species. Named for W. R. Taylor, University of Michigan, author of
Marine Algae of the Northeastern Coast of North America and many contributions
to both fresh-water and marine phycology.
180. Spirogyra liana Transeau 1934. Trans. Amer. Micros. Soc.
53, p. 228.
Vegetative cells 11-16/J. x 75-160/^1, with plane end walls; i chro-
matophore, making 2 to 6 turns; conjugation scalariform and lateral;
tubes formed wholly by the male gametangia; inflated single or paired
fertile cells usually separated by i to 5 nonconjugating cells; zygospores
ellipsoid, 23-^0 m x 35-50 m; median spore wall yellow, smooth. (PI.
XXXIII, Figs. 1(^11.)
China, Szechwan and Kiangsi; Sweden.
Named for Liang Ching Li, Fan Memorial Institute, Peiping, China.
This is one of the smallest of the species with plane end walls in which the
conjugating tubes are formed by the male gametangia. In most of these
species (Nos. 177 to 197), the conjugating cells are arranged singly or in
pairs with one to several intervening nonconjugating cells. At the inception
of conjugation, food substances accumulate in these gametangia and they
become darker green and filled with starch grains. At the same time the
intervening cells become lighter green and the chromatophores become
thinner and narrower. This group of species may be designated the "punc-
tata group" after the first of these species to be described.
S. hydrodictya (No. 177) has these same characteristics and has in
addition the compressed-spherical spores characteristic of the "majuscula
group" of species. This species illustrates one of the difficulties in the path
of anyone who attempts to subdivide the genus Spif-ogyra on the basis of
tube formation or spore form.
Among the replicate species of Spirogyra there is a corresponding group