Anacystis minutissima N.L.Gardner

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THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESHWATER ALGAE OF PORTO RICO
COLLECTED BY N. L. BRITTON
Mountains, Cabo Rojo to San German February 1

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Anacystis minutissima sp. nov.

Plate 5, figure 46

Colonies spherical to somewhat irregular in outline, 15-25 m
(up to 45 m) diam.; cells densely crojwded together, 0.8-L2 n
diam., pale aeruginous, often tinged with yellow; tegument thin,
homogeneous, close-fitting, hyaline.

Growing in association with other Myxophyceae among moss
on a water pipe near a stream, Maricao, no. 1194 a, type; on tree
trunks, Coamo Springs, no. 300 d; on a wall at a bridge in Ca-
guas, vo. 462; on broken rock about seven kilometers east of
Coamo, no. 1869 e; on a wall at Hot Springs, no. 402 b; in the
overflow from a hot opening, Coamo Springs, no. 402 b; on a
brick wail near Juan Martin, Fajardo, no. 732 a; in the overflow
from a hot spring, Coamo Springs, no. 367 e.

The specimens of this species of Anacystis are almost per-
fect spheres when young, and for the most part retain the
shape to maturity. Apparently the resting spores merely de-
velop a very thin, smooth wall at maturity. The species seems
closely related to A. firm« (Breb. & Lenorm.) Schmidle, but does
not form the firm, mucous stratum characteristic of that species.
There is also much less variation in the size of the cells.

THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESH WATER ALGAE OF PORTO RICO
COLLECTED BY PROFESSOR N. WILLE
Seven km. east of Coamo march 20, 1915

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