RN E Ee, emm B : d SS £25 ge E Eet 15d 
1900] Collins, — Notes on algae, — II. 13 
our limits. P. calothrichoides, p. 30, Pl. I., figs. 6-10, was found, in 
company with various other Schizophyceae, by the writer at Nabant, 
Mass. ‘The trichomes are from 2 to 2.5, in diameter, with short 
articulations ; the sheath, quite thick and dark colored in the middle 
of the filament, becomes extremely thin and colorless at the extremi- 
ties, giving a Calothrix-like appearance, though the trichome does not 
taper. 
P. Golenkinianum, p. 35, Pl. I., fig. 11, founded on a plant growing 
in a tank at the Biological Station at Naples, was found also in a mass 
of various minute algae, growing on overhanging rocks, Eagle Island, 
Penobscot Bay, Maine. ‘The stratum is of a rosy or brownish red, the 
trichomes even thinner than in P. calothrichoides, 1.2 to 2p diameter, 
the sheaths of uniform thickness. 
These two species have been distributed in the Phycotheca Boreali- 
Americana, under Nos. 604 and 603 respectively. 
There have been some algae recently distributed in the Phycotheca, 
from New England localities, as new forms or varieties ; for the purpose 
of removing any doubt that might exist of the validity of descriptions, 
published only in labels, they are here reproduced. 
CALOTHRIX FASCICULATA forma incrustans Collins. C. Contarenii 
Collins in Bulletin Torrey Bot. Club, vol. xviii, p. 336, 1891; not of 
Bornet & Flahault. On rocks in littoral zone, Revere Beach, Massachu- 
setts, September 29, 1895. No. 561. Filaments slenderer than in 
type, .008-.012 mm. diam. ; habit like C. Contarenii ; forming a smooth 
incrustation on rocks, so dense that it can often be stripped off in the 
same way as C. pulvinata. 
VAUCHERIA PILOBOLOIDES var. compacta Collins. Mystic River 
Marshes, Malden, Massachusetts, September, 1897. No. 477. Forming 
a plush-like mass among Salicornia, etc., on ground overflowed at high 
tide only. Habit like V. ZAureti Woronin ; the stratum so dense that 
large sheets can be cut out with a knife, and lifted up. Dimensions of 
filament as in typical V. pcloboloides ; oogonia and antheridia as in type, 
except that the oospores are usually spherical, but sometimes lentiform ; 
oogonia and antheridia scattered over the filaments, not in any ap- 
parent definite relation to each other. 
EcrOCARPUS CONFERVOIDES (Roth) Le Jolis, forma brumalis 
Holden. On muddy turf of Spartina roots, near high water mark, 
Charles Island, near Milford, Connecticut, December 25, 1898. No. 
576. A winter form; fronds mostly 1-2 cm. long; main filaments 
about .o25 mm. diam.; branches .012-.020 mm. diam. Plurilocular 
sporangia varying much in shape, from cylindrical to shortly conical ; 
length sometimes over .15 mm.; width .o15—.025 mm.; often curved 
