244 ALGJE CHLOROSPERME^:. [Palmetta. 



by supposing that this stipes has been noticed by those who hold such 

 opinions. 



7. U. furfuracea, Horn. Furfuraceus Ulva. Fronds very 

 minute, roundish, ovate, distinct, sub-erect, forming a thin 

 crowded stratum ; sporidia large, mostly in fours. Hook. Br. 

 Fl. v. ii. p. 312. Grev. Crypt. Fl. t. 265. 



On damp walls, &c. in several places about Limerick ; W. H. 

 Harvey, 



80. TETRASPORA. Link. Tetraspora. 



Frond tubular, inflated or plane, gelatinoso-membranaceous, of 

 a green colour. Fructification : minute granules, mostly ar- 

 ranged in fours. Name; TTpa,four, and air o pa, a seed; from 

 the arrangement of the sporules. 



1. T. gelatinosa, Desv. Gelatinous Tetraspora. Frond ve- 

 sicular, ovate, clavate, very gelatinous. Ag. Hook. Br. FL v. ii. 

 p. 313. 



Fresh water stream at Mucruss, Killarney. Fronds exceedingly 

 lubricous and gelatinous, but firm, delicately w'aved and plaited, of an 

 ovate outline, attached to water plants. Sporules arranged in fours, or 

 irregularly scattered. 



2. T. lubrica, Ag. Lubricous Tetraspora. Frond quite 

 simple, tubular, gelatinous, waved and sinuated. Hook. Hook. 

 Br. Fl.v. li.p. 313. 



In running fresh water. Castlemartyr ; Miss Sail. Larger than 

 the preceding, less gelatinous, with a more distinct membrane. 



81. PALMELLA. Lyngb. Palmella. 



Plant a polymorphous gelatinous mass, filled with scattered 

 globular or elliptical granules. Name; 7ra\/ios, vibration} 

 from the loosely gelatinous nature of these plants. The gra- 

 nules are sometimes arranged in fours, in which case the line 

 of distinction between Palmella and Telraspora vanishes. 



1. P. protuberant, Ag. Soft shapeless Palmella. Gelatine 

 thick, irregularly lobed, very soft, green ; granules elliptical. 

 Harv. in Hook. Br. Fl. v. ii. p. 396. Grev. Crypt. FL t. 243. 

 /. 1. Ulva protuberant, E. Bot. t. 2583. 



Moist rocks, among mosses. 



2. P. cruenta, Ag. Purple Palmella. Frond crust-like, in- 

 determinate, very thin, of a full red colour. Grev. Crypt. Fl. 

 t. 205. Tremella cruenta, E. Bot. t. 1800. 



On moist limestone or white-washed walls, frequent in cellars* 



3. P. botryoides, Lyngb. Small clustered Palmella. Mi- 

 fcute ; fronds densely crowded, globose, somewhat lobed, green. 



