42 ERYTHEA. 



be interesting to know if the distinction observed by Sauvageau 

 holds good in this species. Mega- and meio-sporangia have been 

 ol)served in E. Mitchellce Harv. (E. vireseem Tlmret), by Mrs. E. 

 Snyder, at La JoUa, California. 



E. corticidatus presents a curious feature in the "apparent" 

 occurrence of plurilocular sporangia on the corticating filaments; 

 if this proves to be the case, the plant is of special interest. 



E. confervoides forma variabilis is described as having seriate 

 unilocular sporangia on the same filament as plurilocular sporangia 

 of the usual form. No reference is made to previous observations 

 of these formations, and the discussion they have caused. The 

 first notice appears to have been by Rosenvinge, J who cotisidered 

 them, as does Mr. Saunders, as unilocular sporangia. Kuckuck§ 

 then observed them, and suggested that they were probably pluri- 

 locular sporangia arrested in growth, and taking on an abnormal 

 form. Sauvageau II refen-ed them to a parasitic origin of a 

 Chytridiaceous character; and Rosenvinge^ now accepts this view, 

 except that he finds the parasite to be rather a Vampyrella than a 

 Chytridium. As these formations are found in other species as well 

 as in E. confervoides, the form hardly deserves a special name. 



The Encoeliacese in this paper present little opportunity for 

 criticism; the habit figures are excellent, and with the anatomical 

 figures make plain enough the differences between the genera ; as 

 each genus has only one or two species in Californian waters, there 

 should be little difficulty now in their recognition. Of the genera 

 into which Agardh has divided the old Punctaria, Homeostroma 

 has been taken for the Californian plant which would have been 

 called P. latifolia; the new genus Halorhipis is proposed for the 

 Punctaria Winstonii of Dr. C. L. Anderson. 



The paper contains some errors for which the printer is probably 

 responsible: "Long and colorless hairs are born on the branches " 

 (p. 149); "forming a rope-like, spongy mass" (p. 155); "twice 



J Kosenvinge, Gronlands Havalger, p. 883, 1893. 



I Kuckuck, Wissenchlaftliche Untersuchungen, p. 234, 1894. 



II Sauvageau. Sur les Spores en Chapelet de I'Ectocarpus confervoides; 

 Jour, de Bot., Vol. X, p. 41, 1896. 



T[ Kosenvinge, Deuxi6me Memoire sur les Algues de Greenland, p 76, 

 1898. 



