APHANOCAPSA. 333 



forms in Rabenhorst's long list. They have no value avS 

 plants, hence do not name them. The above are briefly 

 quoted to show how easily species may be multiplied by a 

 too close notice of non-essential phases. 



As we have a number of species of tiirosip/ion, from vari- 

 ous habitats as moist rocks, trunks of trees, earth and water, 

 it is but reasonable to suppose that the macrogonidia may 

 vary as well. The large quantities observed belong to >V. 

 pulvinatus. Macrospores of other species of 8irosiplion 

 were too few to enable us to determine any distinctive fea- 

 tures. A general and variable character appears common 

 to all of them. 



Genus 119, APHANOCAPSA, Naeg. 



Cells spherical, with a thick, soft colorless tegument, confluent 

 in a homogeneous mucous stratum ; cells divide as in Gloeocapsa. 



APHANOCAPSA GREVILLEI, (Hass. ) Rab. 



Thallus gelatinous, globose, densely aggregated, more or 

 less confluent, dirty green, from olive to brownish with age 

 and when dry ; cells spherical or elliptic, somewhat crowded, 

 singly or in pairs ; tegument quickly diffluent ; cytioplasm 

 light aeruginous. 



Diameter of cells, 3.5-5 yw. 



Syn. Coccochloris Grevillei, Hass.; Palmella botryoides, Grev. ; 

 Palmella Grevilleij Berk. ; Botrydma Grevillei, Menegh. ; 

 Byssus botryoides, Huds. ; Pleococcus Grevillei, Trevis. 

 Submerged stones, in shallow pond water. 



Plate CCX, figs. 38, 39, a small thallus, natural size, and 

 a cell greatly magnified. 



APHANOCAPSA VIRESCENS, Rab. 



Thallus gelatinous, more or less expanded, dirty green or 

 olive, becoming brownish ; cells rather pale aeruginous, scat- 

 tered singly or some in pairs. Tegument rather indistinct. 



Diameter of cells, 5. 5 /*. 



Syn. Sorosporlum virescens, Hass. ; Aphanocapsa parietina, Naeg. 

 On wet stones or rocks. 



Plate CCX, fig. 33, part of a thallus, natural size; figs. 

 34-37, cells greatly magnified, which are referred with some 

 hesitancy to this species. They were found separated from 

 the thallus, floating in pond of somewhat stagnant water. 

 They are not unlike the teguments and cells which make up 

 the thallus, but larger. 



