HORMOSPORA. 189 



tending from the base to near the apex, color light brown 

 or dull green. 



Sometimes in abundance in exposed, stony, rapid moun- 

 tain streamlets. 



Plate CLXIV, figs. 1, 2, thallus of H. penicillatus about 

 half of normal size ; figs. 3, 4, small part of a branchlet 

 greatly enlarged showing the scattered cells ; figs. 5, 6, two 

 young plants ; figs. 7, 8, 9, three cells taken from branchlet 

 (4, 5), much enlarged ; fig. 10, first condition of develop- 

 ment ; figs. 11, 12, progressed condition, cells dividing in 

 one direction ; fig. 13, cells dividing in two directions. 

 After Eostafinski, figs. 14, 15, two small fronds of H. irregu- 

 laris, forma confusa ; figs. 16, 17, two thalli of H. Duduzelii. 



Genus 53, PALMODACTYLON, Naeg. 



Cells dull green, small, globose, enclosed in a colorless cylin- 

 drical bladder-like membrane, often diffluent ; sometimes with 

 transverse septae, making a series of small cells. Two, four or 

 many of these tubular bladders with rounded apices, connected 

 at one end, spreading radiately. Division of internal cells at 

 first in one direction, later in two. One, two or four series of 

 cells in each membrane. 



PALMODACTYLON VARIUM, Naeg. 



Family composed of numerous cylindrical bladder-like 

 cases, radiately disposed by being connected at one end, 

 each containing one, two or more rows of small cells. 

 Diameter of cells 4-7 //; cylindrical sacks average about 

 36 ,u wide and 100 yu long. 



Stagnant ponds. 

 Plate CLXXXVII, figs. 8, 9. 



PALMODACTYLON SIMPLEX, Naeg. 



Family simple, without branches, more filamentous struc- 

 ture, otherwise like the last. Habitat the same. 



Can not reconcile my mind to the value of these forms. 

 They occur now and then, but always leave the impression 

 of their valuelessness as true plants. 



Genus, HOEMOSPOEA, Breb. ( A pseudo-genus. ) 



To this genus were reckoned a number of forms with oblong 

 cells arranged in a single series, surrounded by a wide, colorless 

 tegument, floating in families or clusters. It has been shown 



