162 ULOTHRICACEAE 
18 May, 1901 (570B). Mt. Desert, Maine, July 17, 1900 (F. S. 
Collins). 
The figure accompanying Professor Wille’s original description 
of this form leads us to doubt whether our American specimens 
should be identified with it. There is no question, however, that 
both of the Connecticut specimens are the same species and also 
no question, in our judgment, that they should be referred 
to Stichococcus rather than to Ulothrix. 
Professor Wille’s identification of the specimen issued in the 
Phycotheca was not based, of course, upon living material, a con- 
dition which is essential to a critical treatment of such fine species. 
Under the kind direction of Mr. Holden, we made a careful 
attempt to duplicate the specimen from the same station, but in 
vain. In a tidal creek of the same harbor, however, where the 
conditions were exactly similar, we obtained material which was 
undoubtedly of the same species as that collected by Mr. 
Holden. 
From a careful study of this fresh material in comparison with 
exsiccatae, the species proves to be more closely allied to ول اک‎ 
coccus subtilis than to Ulothrix variabilis. The cells are frequently 
longer than in the latter species, the chromatophore is more like 
that of S. subtilis and lacks the clearly refractive pyrenoid charac- 
teristic of Ulothrix. The appearance of the chlorophyll was 
decidedly different from that of U. implexa with which this species 
was associated, and showed the bluer tint which is more character- 
istic of many Stichococcus species. The fact that only one zodspore 
was formed in a cell, while not conclusive proof, points ۱۵ 5 
rather than Ulothrix, for filaments of U. implexa possessing only a 
slightly larger diameter contained several zodspores in a cell. On 
the whole, therefore, we are convinced that the species belongs in 
Stichococcus. 
4. STICHOCOCCUS SUBTILIS (Kütz.) Klercker, Flora, 82: 103. 1896 
Ulothrix subtilis Kitz. Phyc. Germ. 197. 1845; Spec. Alg. 
345. 1849; Tab. Phyc. 2: p/. 85. f. 7. 1852. Rabenh. Flor. Eur. 
Ale 3: 365. 1868. Kirchn. Krypt. Flor. Schles. 2': 77. 7. ۰ 
1878. . Wille, P. W- Ale. 13%: A. 140. f. 9, 10. f. f. 1887. 
Chodat, Beitr. Krypt. Flor. Schweiz, 1?: 268. 1902. 
BEE MT 
