1908] Collins,— Notes on Algae. IX 155 
all that will remain of its present profusion of plant life will be the 
specimens in the herbaria of the few collectors interested in city 
botanizing. 
BosroN, MASSACHUSETTS. 
NOTES ON ALGAE. ІХ, 
Е. S. Coins. 
GLOEOCYSTIS SCOPULORUM Hansgirg in Foslie, Contributions to 
knowledge of the marine algae of Norway, I. East Finmarken. Tromso 
Museums Aarshefter ХПІ, p. 155, 1890. This species was described 
by Hansgirg from material sent him by Foslie, collected in northern 
Norway; the material was found in clefts of rocks at high water mark 
and contained a number of minute forms, some of which Hansgirg 
described as new, while he identified others with already described 
species. Prof. Foslie has kindly furnished the writer with some of 
these forms, among them G. scopulorum. It forms gelatinous masses 
of greenish yellow color with cells 4-6 гіп diameter, united in colonies 
of two to eight cells, with distinctly stratified envelop. At Ragged 
Island, off Harpswell, Maine, in July, 1908, the writer found in a 
warm-water pool, above high water mark, among various small green 
and blue-green algae, an organism agreeing exactly with Foslie's 
specimen. But it is well known that in stations of this character plants 
often undergo strange transformations, Ulothrix, for instance, assum- 
ing Palmella and Gloeocystis forms that no one would connect with 
the normal form unless by observing the transitions. One can hardly 
resist the suspicion that G. scopulorum is some such stage of a Ulo- 
thrix or a Urospora, which are common in such stations in spring. 
Pnorococcvus OVALIS Hansgirg, l. c., p. 159, Pl. III, fig. 12. Another 
doubtful form occurring in similar stations with the last mentioned 
species. ‘The cells are ovoid or ellipsoid, 8-10 м 9-12 и, with thin 
wall and yellow-green contents, solitary or congregated in a formless, 
not specially mucilaginous layer. At the Ragged Island locality a 
form occurred agreeing with this description, and with the specimen 
from Foslie. 
