Vaucheria.] ALO.E CHLOROSPERME.E. 233 



2. C. Bursa, Ag. Pouch Codium. Frond sphaerical, hol- 

 low. Hook. Br. FL v. ii. p. 3 1 8.— Fucus Bursa, Turn. Hist. 

 t. 136. 



Very rare. Belfast ; Mr. Templeton. 



68. Bryopsis. Lamour. Bryopsis. 



Frond membranaceous, filiform, tubular, cylindrical, glistening, 

 branched ; the branches imbricated, or distichous and pin- 

 nated, rilled with a fine green, minutely granuliferous fluid. 

 Grev. — Name; fipvov, a moss, and w\jst?, an appearance. 



1. B. plumosa, Ag. Feathered Bryopsis. Frond filiform, 

 branched, naked below, the branches scattered, spreading, twice 

 or thrice pinnated, the pinnae pectinated. Grev. — Hook. Br. FL 



'v. ii. p. 318. — Ulva plumosa, E. Bot. £2375. 

 Rocks, &c. in the sea, not rare. 



2. B. hypnoides, Lamour. Hypnum-like Bryopsis. Frond 

 slender, very much branched; the branches long; the ramuli 

 capillary, irregularly inserted, somewhat erect, the lower ones 

 elongated. Grev. — Lamour, Journ. Bot. 1809. p. 135. t. 1. f. 2. 

 — B. Arbuscula, Ag. Sp. Alg. v. i. p. 457. 



On the sides of rocky pools, left by the receding of the tide. Near 

 Portrush ; Mr. D. Moore. ©. Summer and Autumn. Nearly allied 

 to the preceding, depending chiefly for its characters upon the 

 nearly erect irregular ramuli. 



69. Vaucheria. D C. Vaucheria. 



Fronds aggregated, tubular, continuous, capillary, coloured by 

 an internal green pulverulent mass. Fructification : dark- 

 green homogeneous vesicles (coniocystse) attached to the 

 frond. Grev, — Named in honour of the Rev. T. P. Voucher 

 of Geneva, author of an admirable treatise on Fresh-water 

 Confervae. — Nine species of this genus are enumerated in 

 Dr. Hooker's British Flora, all of which are probably to be 

 found in Ireland; but I regret, that, never having paid much 

 attention to these plants, I am unable to introduce more than 

 the following five, and for the characters of these I must rely 

 on Greville and Carmichael. 



* Vesicles solitary. 



1. V. dichotoma, Ag. Large dichotomous Vaucheria. Fila- 

 ments dichotomous, fastigiate; the vesicles solitary, globose, 

 sessile. Grev. — Hook. Br. Fl. v. ii. p. 319. — Conf. diehotoma, 

 Dillw. t. 15. E. Bot. t. 932. 



2 v 



