291 



On the Antheridia, etc., of some Floridej:. 

 By T. H. Bufpham, A.L.S. 



{Bead June 16th, 1898.) 



Plates XIII., XIV. 



In a paper on this subject, read in October, 1890 {Journal, 

 vol. iv, ser. ii, p. 246), after descriptions of the antheridia of 

 certain Floridese, I briefly mentioned by name only others that 

 were collected in August, 1890. The following notes include 

 the latter together with others acquired since. With two 

 exceptions (which are indicated in the proper place) I have 

 drawn none which have been figured before, but to render the 

 record for this country more complete some others are included 

 although described abroad. Unless otherwise indicated the 

 specimens were collected by myself, but I have to acknowledge 

 my indebtedness to Mr. J. T. Neeve, of Deal, for several of the 

 most interesting species. He has intelligently followed my 

 suggestions, and furnished me, for study, with small collections 

 at seasons when I could not visit the shores for the purpose. 

 Where the present names differ from those in Harvey's Fliy- 

 cologia Britannica the latter are placed in parentheses. Speci- 

 mens have generally been preserved in a saturated solution of 

 sodium chloride, but sometimes in glycerine. 



This and the next alga are remarkable parasites. The pre- 

 sent one — Ghoreocolax Polysiphonice Reinsch. (not in Phyc. Brit.) 

 — is found on Polysiphoma fastigiata Grev. The endophytic 

 portion consists only of a few slender filaments whereas the 

 external portion is wholly devoted to the development of re- 

 productive organs. The antheridia are single or in groups of 

 several, each antheridium being globose or sub-reniform, about 

 •5 mm. in diam. It may be distinguished by the circumstance 

 that the surface is dark, with numerous bright circular spots, 

 about 12 /x, in diam., and in these a few dots appear (Plate XIII., 

 Fig. 1). A vertical section shows that the pollinoidigenous cells 



