262 



of Japanese Algae", vol. I, pi. VIII, figs. 6 7. The tetrasporangia are 

 developed generally in abundance throughout the whole stichidial 

 body, in every case in the short ones, in the longer ones mostly 

 in their upper end; sometimes the tetraspores are also developed 

 in the upper end of the filaments which bear the tetrasporic 

 branchlets. 



As I have already remarked, the antheridial stands of the 

 genus Acanthophora have only been found in Acanthophora orien- 

 talis. ASKENASY has described and figured them in "Forschungs- 





Fig. 257. Acanthophora spicifera (Vahl) Borgs. A, ramulus with antheridial 

 stand. B, a cystocarp. C, part of a tetrasporic plant with stichidial ramuli. 



(About 20 : 1). 



reise S. M. S. Gazelle", IV Theil, 1888, Botanik (Algen), p. 48, 

 tab. IX, figs. 11 and 12. In my material of Acanthophora spicifera 

 male plants were fairly abundant and the antheridial stands (Figs. 

 252, 253 C) seem to be very similar to those of Acanthophora 

 orientalis. The antheridial stands of Acanthophora remind one 

 very much of the well-known ones of the genus Chondria, so 

 splendidly figured by THURET et BORNET in Etudes phycologiques, 

 p. 88, pi. 45 and 46. 



The antheridial stands are developed from the first side 

 branch of the trichoblast (Fig. 258 A), the sterile part of it is 

 commonly very perishable and the fully developed, ripe antheri- 

 dial stands are therefore placed apparently terminally upon the 



