220 ALGM CHLOROSPERMEA:. 



branched. In . rose-red, in 0. dull bluish-grey. This closely resem- 

 bles the marine T. virgatula. 



Div. III. CHLOROSPERME^E. 



Plants growing either in the sea, in fresh water, on damp 

 ground, or in anomalous situations; filamentous, membrana- 

 ceous, or amorphous ; either hyaline or (owing to the presence 

 of an internal granular mass), of a grass green, very rarely 

 purple colour. Fructification: green or purple sporules, either 

 filling the frond or collected into sporidia, rarely forming exter- 

 nal capsules. 



TRIBE XIV. LEMANIE^E. 



Plants growing in fresh water, filamentous, inarticulate, of a 

 cartilagineo-coriaceous substance and cellular structure. Fronds 

 hollow, furnished at irregular distances with whorls of papillae, 

 or moniliform. Fructification: fasciculate, simple or dichoto- 

 mous, moniliform filaments, attached to the inner surface of the 

 tubular frond, and finally dissolved into elliptic sporules. 



57. LEMANIA. Bory. Lemania. 



Frond filiform, tubular, coriaceous, cellular, torulose. Fructi- 

 fication : hyaline sporules, aggregated into moniliform, simple 

 or branched penicellate filaments, attached to the inner face 

 of the tubular frond. Name in honour of a French Alogolo- 

 gist, M. Leman. 



1. L. fiuv iatilis, A g. River Lemania. Filaments branched, 

 olive-green, torulose, attenuated ; intervals between the swell- 

 ings cylindrical, much longer than they are broad. Hook. 

 Hook. Br. Fl. v. ii. p. 322. Cow/, ftuv. Dillw. t. 29. E. Bot. 

 t. 1763. 



Rocky beds of rivers, in subalpine districts. Common in the rivulets 

 about Killarney, Arc. 



TRIBE XV. BATRACHOSPERME^. 



Plants growing in fresh water, filamentous, articulate, in- 

 vested with gelatine. Fronds composed of aggregated, articulate, 

 longitudinal fibres, whorled at uncertain intervals with short, ho- 

 rizontal, moniliform ramuli. Fructification: dense globular 



