Vol. 49 : No. 5 
BULLETIN 
OF THE 
TORREY BOTANICAL CLUB 
MAY, 1922 
New British and American species of Lobomonas: 
a study in morphogenesis of motile algae 
Tracy E. HAZEN 
(WITH PLATES 5 AND 6) 
The genus Lobomonas was established in 1899 by Dangeard 
(3) on a single species, L. Francei, found somewhat frequently 
in the vicinity of Poitiers, France. This species had been figured 
twenty-one years previously by Stein (7, pl. 73, f. 17, 18) asa 
form of Chlamydomonas pulvisculus Ehrenb. Golenkin also 
appears to have had this species in Russia, and to have confused 
it with another genus, for one of his figures (5, f. 19), described 
as a reduced form of Pteromonas alata (Cohn) Seligo, can hardly 
be anything else than a young cell of L. Francei. Apparently 
the species has not been studied or scarcely even reported other-. — 
wise, except by Dangeard. In 1902 Chodat (2) transferred to 
the newly founded genus his species Chlamydomonas stellata, 
briefly described six years .before (1); he even appears to have 
been doubtful of the distinctness of his form from Dangeard’s 
type, though both species have been accepted by West (8, p. 172) 
and Wille (9, p. 19), who have reproduced the original illustra- 
tions. 
The genus presents a cell organization almost precisely like 
that of Chlamydomonas, probably its nearest relative, with the 
exception that its outer wall is furnished with variable irregulari- 
ties or protuberances, which in the type species are frequently 
more developed on the posterior part of the cell, while in Z. 
stellata the more uniformly triangular lobes are figured as cover- 
ing the wall nearly to the region of insertion of the cilia. It 
[The BuLLetin for April (49: 75-122. pl. 3, 4) was issued May 18, 1922.] 
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