248 ALGM CHLOROSPERMEjE. [Leptomitus. 



as long as broad. Harv. in Hook. Br. Fl. v. ii. p. 383. — 

 Conf. Orthotrichi, Dilhv. t. 89. Conf. museicola, E. Bot. 

 t. 1638. 



On the leaves of various Orthotricha, common. 



4. P. museicola, Ag. Chestnut-coloured Protonema. Fila- 

 ments brown, branched ; branches alternate, divaricate, subu- 

 late ; articulations thrice as long as broad. Harv. in Hook. 



Br. Fl. v. ii. p. 3S3 Conf. castanea, Dilhv. t.72. E. Bot. 



t. 1701. 



87. Hygrocrocis. Ag. Hygrocrocis. 



Filaments hyaline, interwoven into an uniform membrane or 

 gelatine. (Inhabit chemical solutions.) — Name; v^pos, be- 

 longing to tvater, and KpoKis, a little tuft. 



1. H. Atramenti, Ag. Ink Hygrocrocis. Filaments dicho- 

 tomously branched, minute, decumbent, densely interwoven in 

 a white stratum ; articulations longer than broad. Harv. in 

 Hook. Br. Fl. v. ii. p. 384. 



On the surface of ink, very common. The remaining' Biitish spe- 

 cies, which are found in solutions of muriate of barytes, of gum 

 dragon, and of isinglass size, in rose-water and in Madeira wine, may 

 probably be found in this country, but, as I have not seen native spe- 

 cimens (! !), I decline introducing them. 



88. Leptomitus. Ag. Leptomitus. 



Filaments hyaline, erect, parasitical, growing in fresh water or 

 in the sea. — Name ; \e7nos, slender, and /utos, a thread. — 

 These minute organizations usually grow on decaying 

 animals. 



1. L. lacteus, Ag. White Leptomitus. Filaments branched, 

 clustered in a shapeless gelatinous mass, dirty-wdiite ; branches 

 from each dissepiment ; articulations very long. Ag. Syst. 

 p. 48. Harv. in Hook. Br. Fl. v. ii. p. 385. — Conf. lactea, 

 Dillw. t. 79. 



In ditches and rivulets, on stones, wood, &c. I have observed it in 

 ditches near the College Botanic Garden, Dublin, and about Mount- 

 mellick, Queen's County. 



2. L. clavatus, Ag. Club-shaped Leptomitus. Filaments 

 simple, hyaline ; apex clavate. Ag. Syst. p. 49. Harv. in 

 Hook. Br. Fl. v. ii. p. 385. 



On rotten fishes and dead flies (!). 



