Myrionema.] ALQM CHLOROSPERME^. 223 



branched, Harv. in Hook. Br. Fl. v. ii. p. 389. Uha incras- 

 sata, E. Bot. t 967. 



In lakes and streams, attached to stones. 



2. C. tuberculosa, Hook. Tubercular Chcetophora. Frond 

 at first globose and firm, afterwards much lobed, fragile and 

 hollow ; filaments very slender, flexuose, hyaline ; ramuli co- 

 loured, palmato-fasciculate. Harv. in. Hook. Br. Fl. v. ii. p. 389. 

 Rivularia tuberculosa, E. Bot. t. 2366. 



In boggy pools. 



3. C. elegans, Ag. Elegant Chcetophora. Frond subglo- 

 bose, gelatinous, solid, green; filaments subdichotomous ; ra- 

 muli fastigiate, attenuate ; the apices produced beyond the 

 gelatine. Carm. Harv. in Hook. Br. FL v. ii. p. 389. 



In stagnant pools. 



2. Marine) crustaceous. 



4. C. pellita, Lyngb. Purple Crustaceous Chcetophora. 

 Frond purple-brown, crustaceous, gelatinoso-coriaceous, inde- 

 finitely spreading. Harv. in Hook. Br. FL v. ii. p. 390. Berk. 

 Alg.t. I./. 3. 



Rocks and stones in the sea. Miltown Malbay ; W. H. Harvey. 



62. MYRIONEMA. Grev. Myrionema. 



Mass gelatinous (exceedingly minute), effused, composed of 

 very short, clavate, erect, mostly simple filaments, "fixed at 

 their base to a thin expansion." (Grev.) Fruit: capsules 

 at the base among the filaments. Name ; pvpiov, a thousand, 

 and vr]f.ia, a filament. 



1. M. strangulans, Grev. Convex Myrionema. " Subcon- 

 vex, confluent ; filaments subcylindrical ; capsules shortly pedi- 

 cellated, " affixed to the basal lamina." Grev. Crypt, t. 300. 

 Harv. in Hook. Br. Fl. v. ii. p. 391. 



On various Algae, parasitical. 1 2 lines in diameter, brown. 



TRIBE XVII. CONFERVE^. 



Plants growing in the sea or in fresh water, filamentous, arti- 

 culate, without definite gelatine. Fronds very variable in ap- 

 pearance, simple or branched; articulations more or less filled 

 with a green, very rarely brown or purple, granular mass, which 

 affects various forms, and is supposed to be of a sporaceous 

 nature. 



