260 T. H. BUFFHAM ON REPRODUCTIVE ORGANS OF THE FLORIDEiE. 



Iii C. Unuissimum J. Ag. (C. nodosum Griff, et Harv.) the 

 antheridia arc much more readily seen, as the nodes arc prominent, 

 and the antheridia are seated thereon, generally on the inner sides, 

 and rather more on the lower sides, of the nodes of the greater 

 part of the plant. Fig. 4 shows a node with the cortical cells 

 chaiiffinsr into the antheridia which form a cushion of rounded 

 outline and composed of small yellowish cells, x 200. (Sidmouth, 

 Aug., 1886.) 



These bodies have also been observed on several other species of 

 Ceramium. 



C. Dedongchampsii Chauv. : a continuous brownish-white layer 

 on the upper portions of filaments and on the lateral ramuli. 

 (Taken by a friend at Llandudno, July, 1886.) 



C. gracillimum Griff, et Harv. : delicate cushions surrounding 

 the nodes, or on the inner half only. (Brighton, Sept., 1884.) 



C. circinatwn J. Ag. (not in " Phy. Brit. ") : at first chiefly 

 on the inner sides, but later forming an almost continuous layer 

 round the uppermost filaments. (Brighton, Sept., 1884. A 

 tetrasporic plant was found at the same time.) 



Spyridia filamentosa Harv. is a plant delighting in warmth, 

 and therefore is plentiful at only a few stations on our southern 

 shores. At Sidmouth, in sunny pools, it is so, and I determined 

 when there (Aug., 1886) to find, if possible, the antheridia 

 which, so far as I know, have been described only by Prof. W. G. 

 Farlow in " Marine Algae of New England," p. 140. I succeeded 

 only after examining with the microscope some hundreds of 

 specimens. At last, on a plant that had a peculiar tufted appear- 

 ance, I was rewarded. The antheridia were found on the 

 monosiphonous secondary branchlets which in the male plant 

 frequently radiate in small dense tufts from the principal branches. 

 They form, under a low power, a continuous greyish layer over the 

 basal cells of the secondary branchlets, giving it a swollen ap- 

 pearance (fig. 5, x25). Prof. Farlow shows (PL X, fig. 1) a 

 single node surrounded with antheridia and separated from the 

 main portion by a clear part. In my specimen there are no such 

 instances. The younger branchlets have them covering slightly 

 two or three joints ; the development appears to be by the exten- 

 sion joint by joint upwards. A power of 200 shows a rather loose 

 layer of pale cells, each containing an antherozoid (fig. 6). 



Amongst other plants received from Mr. J. T. Hillier, of Rams- 



