36 



SORASTRUM, Ktz.— 5. echinatum, Ktz., ponds, N. J. and Pa. 



GONIUM, Miiller. — G. pectorale^ Mull, in ponds, N. J. 

 - POLYEDRIUM, Naeg. — P, minimum. A, Br., in ponds, Penn. 

 - SPIROGYRA, Link. — Sp. orbicularis^ Hass., abundant in fruit in 

 a small stream, Bethlehem, Pa. ^S^. bellis^ Hass., Budd's Lake, N. J. 

 Bp, condensata coll. by H. H. Rusby near Silver City, New Mexico. 

 Sp, quadrata^ Hass., in river near Bethlehem, Pa. Sp, setiformCy 

 Roth., not new except in the condition of the spores, which present 

 the early stages of development. Sp, fluviatilis^ Hilse. European 

 authors are united in declaring the fruiting of this species unknown. 

 October 8th last I was fortunate in finding the plant in fine fruit in 

 a pond near Bethlehem, Pa. 



The diagnosis should be corrected to read, '' Sp. saturate viridis, 

 minus lubrica ; articulis sterilibus cylindricis, diametro (.1014"— 

 .00159) 2-6-plo longioribus ; sporiferis valde tumidis ; sporis aut 

 ovalibus aut late ellipticis ; diametro .oo2i"-.oo23" ; long. .003"™ 

 .0033''; fasciis spiralibus 4 sublatis, anfractibus densissimis." 



MESOCARPUS, Hass.— ^/. deprassus, Hass., Mobile, Ala., coll. 

 by M. S. McNeil. M, recurvus^ Hass., St. Lawrence River, coll. by I. 

 M. Adams. 



STAUROSPERMUM, YJiz,—S. quadratum, Ktz., in small 

 stream, S. Carolina, coll. by H. W. Ravenel. 



RHIZOCLONIUM, Ktz.— Rh. Hosfordii, n, x/.— Rh.* laete 

 saturate viride, vel luteolo-viride, crispatum, rigidum, fills ramulos 

 breves unicellulares numerosos emittentibus ; articulis diametro 

 (0.016") 2-4-6 plo longioribus ; cytiodermate crasso hyalino homo- 

 geneo. 



Collected near Aurora, N. Y., by F. H. Hosford. It is nearest 

 Rh, Casperi, Harw., but is much firmer, nearly twice the size ; and is 

 purely a fresh-water plant. 



ULOTHRIX, Ktz.— C/^. Jtirgensii, Ktz., coll. by H. W. Ravenel 

 in rice-field ditches near Darien, Ga. 



CLOSTERIUM, Nitzsch. — C. Ehrenhergii, Menegh, var. immane, 

 «. var,^ differs from the typical form mainly in size. Measures .0083'' 

 diameter, nearly twice the diameter of the largest variety of this 

 genus on record. Collected in Budd's Lake, N. J,, Aug. i, 1881. 



COSMARIUM, Corda. — C, anisochondrum, Nord.,^in' Denmark 

 Pond, N. J. C. biremc, Nord., in ponds, Penn, and N. J. C. Clepsydra, 

 Nord., Budd's Lake, N. J. C. globosiim, Bulnh., in ponds, Penn. and 

 N. J. C. galeritum, Nord., in ponds, N. J. C. Holmiense, Lund., on 

 Mt. Mansfield, Vt., coll, by F. H. Hosford. C nitidulum, t)e. Not., 

 coll. by F. H. Hosford. ^ C. orthostic/imn, Lund., in Denmark Pond 

 N. J. C.punciatum, Breb., Penn., N. J. and Mass. C, psetidograna^ 

 turn, Nord., N, J. C quadrifarium, Lund., Mt. Marcy Vt C ru- 



H'^'^'^^f'^^r ^^V ^^"^^"^y- ^^- ^' taxichondrum, Lund., Mt. Marcy, 

 Vt, (The last three were collected by Rev. H. D. Kitchel. The last- 

 named species I have smce found not uncommon in New Jersey ) 

 C. monomazum, Lund., near \d.x. polymiazum, Nord., (Plate xiii Ficrs 

 IS and 15 ) but differs in having 6 papillae on each side of the semi- 

 cells instead of i on one side and 4 on the other, Denmark Pond N T 

 CosMARiuM KiTCHELH, ;j. sp. (Plate xiii; Fig. 3, front view* 



