SOME DESMIDS OF THE UNITED STATES. 309 
114. CosMARIUM CREPERUM, West & G. S. West, in Trans. 
Linn. Soc. Ser. II. (Bot.) v. p. 63, pl. 7. f. 11. 
Long. 34 u; lat. 31; lat. isthm. 13 y. 
Hab. Harvey Lake, Pennsylvania. 
The granules are slightly larger than in the original specimens, 
but otherwise the plants agree in all details. 
115. C. SPINOSPORUM, Lagerh. in Ofvers. K. Sv. Vet.-Akad. 
Fork. 1887, no. 8, p. 538.— C. Broomii, var., Wolle, Desm. U. S. 
pl. 17. ff. 8, 9. 
Hab. Ann Arbor, Mich., abundant and conjugating (H. J. 
no. 311). 
116. C. prorractum, De Bary, Conj. p. 72.—Euastrum 
protractum, Nag. 
Long. 34-36°5 u; lat. 35-36 p ; lat. apic. 18 p; lat. isthm. 
95 p. 
Hab. Harvey Lake, Pennsylvania. 
Fig. 5.— Cosmarium triplicatum, Wolle. 
" & b. Specimens from Minneapolis, x 520. c. Specimen from Scarbro’, 
faine, x520, q. Specimen from Sisson, California (after Johnson), X770. 
117. c. TRIPLICATUM, Wolle, 1883; Desm. U. S. p. 73, pl. 19. 
y 44-52 u; lat. 345-43 p; lat. isthm. 10-14 p; crass. 
`e (Fig. xylogr. 5.) 
a Bridgeport, Conn., common (H. J. no. 215). Ann Arbor, 
Holde Orono and Scarbro’, Maine. Minneapolis, Minnesota. 
“mess (H. J. no, 375) and Plymouth, N.H. Burlington, 
