12 FRESH-WATER ALG^ OF THE UNITED STATES. 



Syn.—C. muUicoloralus, Wood, Prodromus, Proc. Amcr. Philos. Soc, 18G9, 122. 



Eab.—\n nipibus bumidis prope Philadelphia. 



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

 angular senii-sjjherical or irregular and associated together iu 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 granular, either a 

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

 bright lake. 



The cells of this species do not appear to have any tendency to unite to form 

 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. fherinopIi!lii)«, Wood. 



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

 globosis, iuterdum angulosis, baud stratum mucosum formantibus; tcguraento crassissinio, 

 achroo, haud lamelloso, homogeneo ; cytioplasmate viride, interdum subtiliter granulato, inter- 

 dum homogeneo. 



Diam. — Celluloe singulce sine tegumento longitudo maxima-^ gVij", latitude maxima ja'oTy"- 



Syn. — C. therniophilus, 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 

 lamellate, homogeneous ; cytioplasm green, sometimes minutely granulate, sometimes homo- 

 geneous. 



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

 calidarium, W ood. 



Genus GLOEOCAPSA, Ktz. 



" Cellula; sphericK aut singulaj aut numeross in familias consociata; ; singulte tegumento vcsiculi- 

 forme (cytiodermate tumido) inclusce, post divisionem spontaneam iu cellulas duas filiales factam 

 utraque tegumento se induit, dam amba? tegumento matricali involute remanent; cellularum harum 

 Chalinra iterum in duas cellulas divisione continuo repetita, tegumentum ataviaj restat et sese cxten- 

 dens familiam totara circumvelat. Cytioderma crassum, ssepe crassissimum, celluls lumen crassitie 

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

 raro discedentia. Cytioplasma a;ruginosum, casrulco-viride, chalybeum, rufescens, luteo-fuscum, &c. 

 Cellularum divisio directione ad tres dimensiones alternante. Cellulie generationum ultimarum 

 minores quam priorum sunt." (Rab.) 



Syn. — Glohulina et Bicliatia, Turpin, ex part. 

 Gloeoca2)sa, Ktz., ex part. 

 Microcystis, Menegil, ex part. 



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

 vesicuhform tegument (the tumid cytioderm); this cell then underRoin- division into two dau-hter- 



