262 T. II. BUFFHAM OX REPRODUCTIVE ORGANS OF THE FLORIDE.E. 



longtemps lcs antheridies, mais je n'ai jamais vu les cystocarpes." 

 As Dr. Hauck observes : " Cystocarpien bei C. Opuntia nicbt 

 geniigend bekannt "* I mucb regret that I did not secure more 

 material for the better study of the fruit. 



The male plant of Gelidium latifolium Born. (G. corneum 

 Lamour, var. G. latifolium) shows pale, but semi-opaque, patches on 

 swollen parts of the pinnules, which are the antheridia. The cells 

 are oblong, and densely packed vertically. (Weymouth, Aug., 

 1885.) 



The antheridia of Lomentaria rejlexa Chauv. (Chylocladia 

 rejlexa Lenorm.) are found on swollen joints, and appear under a 

 low power as minute greyish] spots on the surface (fig. 12, x 25). 

 With a magnification of 200 each small patch is seen to be com- 

 posed of colourless bodies, somewhat radiate and convex, the 

 patches being confluent (fig. 13). The edge of the frond viewed 

 with 400 (fig. 14) shows that the minute filaments composing 

 the antheridial layer are somewhat branched, the whole being 

 covered by the hyaline gelatinous investment usual to this plant. 

 (Sidmouth, Aug. ; 1886.) 



The male organs of Chondriopsis tenuissima Ag. (Laurencia 

 tenuissima Grev.) are very interesting, and are unlike those of 

 other genera. In this species the antheridia consist of bi-convex 

 disc-like bodies, sometimes contorted, which are borne in clusters 

 at the apices of short lateral ramuli, the convexity being generally 

 unequal (PI. XXII, fig. 15). The antherozoids are elongated, 

 and a little thinner at one end, and the disc on which they are 

 developed is hyaline, with a border of delicate large cells having 

 slightly darker contents. These border cells are free from the 

 antherozoids which otherwise cover botli sides of the disc (fig. 

 16, X 100). As the discs discharge the antherozoids the contents 

 of the large border cells become darker. (Weymouth, Aug., 1885.) 



Intermixed with tetrasporic plants received from Mr. J. T. 

 Hillier, of Ramsgate, Feb., 1885, was a male plant of Rhodomela 

 suhfusca Ag. The antheridia occupy similar positions on the fila- 

 ments, and consist of dense tufts of a brownish-yellow colour, 

 readily seen by the naked eye, springing from the sides of the fila- 

 ments of the plant. A short peduncle divides several times, and 

 on these divisions the branching tufts are produced (fig. 17, X 10). 

 Each ultimate branchlet consists of a cylindrical body of a pale- 

 # " Die Meeresalgen Deutschlands unci Ocsterrichs," p. 186. 



