120 
-Fig. 1, geminate naked spore; fig. 2, quaternate spores at- — 
tached; fig. 3, quaternate spores separated ; figs. 4 and 5, lave 
spores showing enclosed daughter cells, which are only sparingly — 
found in the thallus; fig. 6, very large oblong spore, 20 by 30 /4 
which showed motion; probably zoospore. The zoospores were — 
sparingly scattered through the thallus, and the same color and : 
of the same granular nature as the other spores. Our specimens — 
harbored diatoms and infusoria but no filamentous alge. The — 
form of the thallus of this species is more like 7: expansa (Kg), 
Kirch, but the spores are larger and exceed those of all the 
" species mentioned by Wolle, hence the name 7. macrospora. 
159. Dimorphococcus cordatus, Wolle, p. 199, Pl. CLX.— : 
Among alge, Pushaw stream. October, 1890. 
160. APIOCYSTIS ELONGATA, n. sp. 
Thallus obovate or narrowly pear-shaped, pale green, the. 
cavity filled with gelatinous matter in which are imbedded the 
gonidia, at first about four and increasing with age. Length ag 
thallus in the largest specimens 80 #, and width 30 4 be 
smaller forms were much more narrow in proportion to the length. 
Gonidia 7-11 “. Inthe same gathering were free swimming — 
zoospores about the size of the gonidia, and though we did not 
establish their relation to this species, presume they belonged to — 
it. : 
We give several figures: Figs. 7 and 6, full grown thalli; 
figs. 8 and 10, younger forms observed ; fig. 11, thallus budding. : 
This seems to differ from A, Brauniana, Haeg., in the smaller — 
more elongate form and larger gonidia. Spring pool, college 
farm. October 28, 1891. F. L. Harvey. 
161. Craterospermum letevirens, A. Br., p. 235, PL Cha 
Mr. Wolle says on page 235 F. W. Algze of the U. S., “that 
the only specimens recognized as possibly belonging to this gene 
were collected July, 1880, in Green Pond, N. jJoothe conjugation — 
was complete, but the spores imperfectly developed, hence my 
hesitancy in calling it a pronounced species of this genus.” 
It will therefore be interesting to botanists to know that the — 
writer has found this species in conjugation and with perfect yee 
spores in the Penobscot River at Orono, Me. The specimens Niles 
collected in a mill pond while the gates were open and the water — 
very low. When the pond was full the plant must have bec er 
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