1908] Cushman,— New England Species of Micrasterias. 107 
р. 210, pl. 35, fig. 5; Wolle, Desm. U. S., 1884, p.108, pl. 30, figs. 1-8. 
M. Pseudotorreyi Wolle, Bull. Torrey Club, 1883, p. 19, pl. 27, fig. 2; 
Desm. U. S., 1884, p. 108, pl. 32, fig. 1. Cells large, generally sub- 
circular in outline, deeply constricted, sinus at first narrowly linear 
then opening outward; semicells five lobed, polar lobe broadening 
distally, sides concave, end emarginate with or without a median 
notch, angles acute or with a truncate emargination; lateral lobes 
unequal, in the more common form, the lower with two, the upper 
with three lobules, usually concave with acute angles, occasionally 
the lobules again divided and the interlobular incisions narrower 
but usually opening widely outward; surface without ornamentation. 
Length 215-280 м, breadth 170-310 y, polar lobe 47-90 y, isthmus 
25-38 м №. H.; Pudding Pond, North Conway! Mass.: Mt. 
Everett, Mount Washington (Wolle); Lake Quinsigamond, Worces- 
ter (Stone); Reading! Randolph! There seems to me no doubt that 
M. Pseudotorreyi Wolle is a synonym of M. Torreyi. It is reported 
only from the localities where M. Torrey? is found and in my own 
material specimens were found which bridge the gap in size, and the 
form of the lobes is variable in all the specimens I have seen. In some 
cases specimens were nearly as regular as in Wolle's figure but some- 
thing must be allowed for the conventionalizing of Wolle's figures. 
15. MicnasrERIAS RADIATA Hass., Вт. Alg., 1845, p. 386, pl. 90, 
fig. 2; W. & G. S. West, Brit. Desm., 1905, p. 113, pl. 52, figs. 1-9. 
M. melitensis Ralfs, Ann. Nat. Hist., 1844, p. 260, pl. 6, fig. 2 (not 
М. melitensis Menegh. 1840). М. furcata Ralfs, Brit. Desm., 1845, p. 
73, pl. 9, fig. 2 (not M. furcata Ag. 1827); Wolle, Desm. U. 5., 1884, 
p. 111, pl. 35, figs. 5, 6; Johnson, Bot. Gaz., 1894, p. 58, pl. 6, figs. 
8-14. M. pseudojurcata Wolle, Bull.Torrey Club, 1881, p. 1, pl. 6, 
fig. 3; Desm. U. S., 1884, p. 111, pl. 35, fig. 4. М. furcata var. sim- 
plex Wolle, Bull., Torrey Club, 1885, p. 128, pl. 51, figs. 6, 7; Fr. 
Alg., 1887, p. 40, pl. 59, figs. 6, 7. Cells of medium size, slightly longer 
than broad; very deeply constricted, sinus widely open, often partly 
closed by the basal lobules; semicells five lobed, polar lobe with paral- 
lel sides below, then widely expanding into diverging elongated proc- 
esses; apex furcate; lateral lobes usually once divided but very 
variable, ends furcate, lobules diverging; cell wall unornamented. 
Length 145-192 y, breadth 124-160 y, polar lobe 62-105 y, isthmus 
18-30 p. Me.: Bog between Orono and Bangor; Scarboro’, frequent 
QV. West). Vt.: Johnson! N. H.: Noone's Station! Pudding 
