12 FRESH-WATBR ALG^ OF THE UNITED STATES. 



Syn.—G. multicoloratus, Wood, Prodromus, Proc. Amer. Philos. See, 1869, 122. 



Hub. — in rupibus humidis prope Philadelphia. 



C. occurring scattered in a mucous stratum with other algse; cells spherical and single, or else 

 angular semi-spherical or irregular and associated together in oblong families of from 2-4 

 (rarely 8) ; inner coat thick, hyaline, not lamellate ; outer coat generally wanting, sometimes 

 indistinctly present; endochrome mostly homogeneous, sometimes minutely gra,nular, either a 

 yellowish-green or bluish-green, or yellowish or brown, or blackish, sometimes tinged with 

 bright lake. 



The cells of this species do hot appear to have any tendency to unite to fotm 

 large masses or fronds. On the contrary they are generally very distinct. Their 

 color varies very much, in a larger number of instances they were a decided yellow- 

 ish-green, tinged at some point or other with a beautiful lake. When several cells 

 are formed by division out of one cell, a similar division of the very thick surround- 

 ing gelatinous coat follows separating them finally entirely one from the other. I 

 have seen a single cell which appears to be an encysted form of this, of which I give 

 a drawing. 



Fig. 6, pi. 5, represents different forms of this species magnified 260 diameters. 



C. thermophilns, Wood. 



C. cellulis singulis aut geminis vel quadrigeminis et in familias consociatis, oblongis vel sub- 

 globosis, interdum angulosis, baud stratum mucosum formantibus; tegumento crassissimo, 

 achroo, baud lamelloso, homogeneo ; cytioplasmate viride, interdum subtiliter granulate, inter- 

 dum honiogeneo. 



Diam. — Cellulae singnlse sine tegumento longitudo maximay^^^^^'', latitude maxima j^Vt"- 



Syn. — G. thermophilus, Wood, American Journal Science and Arts, 1869. 



Hab. — Benton Springs, Owen Co., California (Mrs. Parz.). 



Cells single, geminate, or quadrigeminate and consociated into families, oblong or subglobose, 

 sometimes angular, not forming a mucous stratum ; tegument very thick, transparent, not 

 Ij,mellate, homogeneous ; cytioplasm green, sometimes minutely granulate, sometimes homo- 

 geneous. 



Bemarhs. — Eemarks upon this species will be found under the head of Nostoc 

 calidarmm, TVood. 



Genus GLOEOCAPSA, Ktz. 



" Cellulae sphericae aut singulee aut numerosse in familias consociatffi ; singulae teguinento Vesiculi- 

 fornie (cytiodermate tumido) inclusse, post divisionem spontaneam in cellulas duas filiales factam 

 utraque tegumento se induit, dam ambse tegumento matricali involute remanent; cellularum ha,rum 

 filialium iterum in duas cellulas divisione continuo repetita, tegumentum atavise restat et sese exten- 

 dens familiam totam circumvelat. Cytioderma crassum, srope crassissimum, cellulse lumen crassitie 

 ffiquans vel superans, achromaticum vel coloratum, plerumque lamellosum ; lamellas vel strata non 

 raro discedentia. Cytioplasma reruginosum, cseruleo-viride, chalybeum, rufescens, luteo-fuscum, &c. 

 Cellularum divisio directione ad tres dimensiones alternante. Cellulse generationum ultimarum 

 minores quam priorura Sunt." (Rab.) 



Syn. — Globulina et Bichatia, Tuepin, ex part. 

 Oloeocapsa, Ktz., ex part. 

 Microcystis, Menegh., ex part. 



Cells spherical, either single or associated in numbers into families; the single cell included a 

 vesiculiform tegumeht (the tumid cytioderm); this cell then undergoing division into two daughter- 



