220 M. C. COOKE ON PALMODACTYLON SUBRAMOSUM, ETC. 



the accuracy of the determination being vouched for by the learned 

 Professor himself. 



The following is the description of this species, which is figured 

 in outline in " Botaniska Notiser " for 1878 : — 



Vaucheria spluerospora, Nordst. Bot. Not., 1878, p. 177, t. 2. 



Loosely caBspitose, antheridea at the apex of longer, or rarely of 

 the shorter branches, slightly tumid, very often a little incurved, 

 acuminate, furnished about the apex with two (rarely 4) nearly 

 opposite divergent conical processes, connected with the side or the 

 base (at first with the apex) of the oogonium, by means of a short 

 cell destitute of chlorophyll. Oogonium globose, or obovate- 

 globose ; oospore globose, chlorophyllose, membrane not thick, not 

 entirely filling the oogonium. 



Size. Threads •026- , 06 mm. diam. Oogonia *104- , 136 mm. 

 diam. Oospore •088- , 120 mm. diam. 



On the mud at low water of the Thames at Kew. Commonly 

 marine. 



PLATE XIV. 



A. — Figs. 1-6, antheridia of Vaucheria splicer ospor a ; Fig, 7 oogonia 

 with antheridia (after Nordstedt). 



B. — Pahnodactylon subramosum (from photograph x 60). 



