320 ALG/E INARTfCULATiE. [Fauchcria. 



4. V.Dillwynii, Ag. (Dillwyns Vaucheria); fronds branched 

 flexuose, vesicles globose lateral sessile. — Lyngb. Hydroph. 

 Dan. p. 77. t. 21. Ag. Sp. Alg. v. 1. p. 463. Grev. Alg. Brit, 

 p. 191. t. 19. — Ceramium Dillivynii, Roth. — Conferva frigida, 

 Dilltv. Conf. p. 49. 



On the ground in damp situations, common. 0. Spring and 

 Autumn.—" It forms a very thin intricate fleece, of a green colour, creep- 

 ing over the earth. Vesicles numerous, globular or slightly depressed, 

 sessile or on short pedicels." Carm. MSS. 



5.V. terrestris, De Cand. {ground Vaucheria); filaments straight 

 forming a lax somewhat bristly stratum (upon the ground), 

 vesicles lateral hemispherical on the side of the horn-shaped 

 peduncle or receptacle. Grev.—Ag. Sp. Alg. v. I. p. 465. Grev. 

 Alg. Brit. p. 191. — Ectosperma terrestris, Vauch. 



On the ground, in moist shady places. 0. Spring.—" Frond more 

 straight and rigid than in the preceding species, forming a more or less 

 interwoven stratum, the summits of the little branches often erect and 

 giving the whole a bristly appearance." Grev. 



** Vesicles 2 or more together. 



6. V. sessilis, De Cand. (sessile-fruited Vaucheria); fronds en- 

 tangled in floating masses, vesicles oval sessile in pairs with an 

 intermediate little horn-like process. Grev. — E. Bot. t. 1765. 

 Lyngb. Hydroph. Dan. p. 80. t. 22. Ag. Sp. Alg. v. 1. p. 466. 

 Grev. Alg. Brit. p. 192. 



Pools and ditches, Sussex. 0. February. 



7. V. omithocephala, Ag. (Birds-head Vaucheria); filaments 

 loosely branched and entangled in dense floating masses, vesi- 

 cles unilateral binate or quaternate oblique upon short straight 

 peduncles with a short beak and pellucid border. Grev — 

 Ag. Sp.Alg. v. I. p. 467. Hook. El. Scot. P. II. p. 93. Grev. 

 Alg. Brit. p. 193. — Conferva vesicata, Dillw. Conf. t. 74. 



Pools and ditches. 0. Autumn. 



8. V. gemi?idta, De Cand. (twin-fruited Vaucheria); fronds 

 dichotomous very slender forming dense floating masses, 

 vesicles ovate opposite laterally pedunculate on a horn- shaped 

 process or receptacle. Grev — E. Bot. t. 1766. Lyngb. Hy- 

 droph. Dan. p. 80. t. 23. Ag. Sp. Alg. v. 1. p. 467. Grev. Alg. 

 Brit. p. 193. t. 19. — Ectosperma geminata, Vauch. Conf. p. 29. 

 t. 2.f. 5. 



Pools and stagnant waters. 0. Spring and Summer.— "This species 

 forms an extremely dense green stratum, a foot or more in diameter ; 

 usually decaying in the middle and leaving there an empty space. Fila- 

 ments dichotomous. Peduncles mostly on one side, in length about 

 two diameters of the filament, bearing two opposite globular vesicles, 

 with a straight (curled, or often reflexed, Grev.) intermediate process." 

 Carm. MSS. 



