1907] | Cushman,— New England Species of Penium 233 
Penium minutum Cleve, Ofvers. af K. Vet.-Akad. Fórh., 1864, p. 493; 
Wolle, Desm. U. S., 1884, p. 35, pl. 5, figs. 19, 20; W. & G. S. West, 
Brit. Desm., vol. 1, 1904, p. 101, pl. 10, figs. 1, 2. 
Calocylindrus minutus Wolle, Desm. U. S., 1884, p. 54, pl. 5, figs. 
19, 20, pl. 12, fig. 12. 
Cells elongate cylindrical, 8-12 times as long as wide, with a clearly 
defined median constriction, gradually attenuated to the truncate 
apices, cell wall colorless, smooth or punctate. 
Length 114 u; breadth 13 p. 
Mass.: Lake -Quinsigamond, Worcester (Stone); ‘Tewksbury 
(Lagerheim); R. I.: (Bailey). 
I have not as yet found the typical form in New England. ‘The 
measurements are those given by Lagerheim of a Massachusetts speci- 
men. 
PENIUM MINUTUM, var. ELONGATUM W. & G. S. West. 
Penium minutum, var. elongatum W. &'G. S. West, Trans. Linn. 
Soc. Ser. 2, Bot. vol. 6, no. 3, 1902, p. 136; Brit. Desm., vol. 1, 1904, 
p. 104, pl. 10, fig. 8. 
Cells much longer than in the typical form, 40 times as long as wide. 
Length 372 u; breadth 9 p. 
N. H.: Pudding Pond, North Conway! 
PENIUM ANNULARE West. 
Penium annulare West, Journ. Bot., vol. 29, 1891, p. 354, pl. 315, 
figs. 5, 6; Johnson, Bull. Torrey Club, vol. 21, 1895, p. 290, pl. 239, 
fig. 1. 
“Penium of medium size, about 7 times as long as wide, subcy- 
lindrical, with median constriction (or subconstricted), gradually 
attenuated from the middle to the subtruncate apices, with distinct 
annulations (about 14-22): in end view circular; cell wall colorless, 
densely and irregularly punctate.” : 
Length 130-177 x; breadth 20-23 y. 
Me.: Scarbro’, abundant (W. West). This is the type locality. 
PENIUM ANNULARE, var. OBESUM West. 
Penium annulare, var. obesum West. Journ. Bot., vol. 29, 1891, 
p. 354, pl. 315, fig. 7. 
