288 Viiivcrsity of California Puhlications in Botany [Vol.8 



the non-piliferous cells; plate-like, perforate, with 5-10 pyrenoids, 

 that of the piliferous cells, irregular and toothed, with 2 pyrenoids ; 

 zoospores (?) 2-ciliated, produced from non-piliferous cells somewhat 

 enlarged on the upper side. 



Pringsheim, Beitr. z. ]\Iorph d. Meeresalg., 1862, p. 1 ; Collins, 

 Green Alg. N. A., 1909, p. 283. 



The species of Bulhocolcon are those members of the Chaeto- 

 phoraceae whose cells are in branching filaments which bear groups 

 of specialized cells produced into continuous (i.e., non-septate) hairs. 

 They are generally endophytic in gelatinous brown and red algae 

 and have 2-ciliated zoospores. Little is known of this genus on our 

 coast and it seems more than likely that related genera provided with 

 hairs may also be found. Careful search and examination should be 

 made for Bulhocoleon and other piliferous genera of the family Chaeto- 

 phoraeeae in and on the gelatinous or lubricous species of brown and 

 red algae of our coast. 



Bulbocoleon piliferem Pringsheim 



Non-piliferous cells 12-16jli diam., 2-3 times as long as broad. 



On Cimiagloia Andersonii (Farlow) S. and G. Southern Califor- 

 nia (Sari Pedro). 



Pringsheim, Beitr. z. Morph. d. Meeresalg., 1862, p. 8, pi. 1 ; Hazen, 

 Ul. and Chaet. U. S., 1902, p. 227 ; Collins, Green Alg. N. A., 1909, 

 p. 283. 



Thus far, Bulhocoleon piliferum has been detected only in the fronds 

 of Cumaglom Andersonii in southern California (San Pedro, Miss 

 S. P. Monks, Mrs. H. D. Johnston). It is likely to occur along our 

 coast northward to the region of Puget Sound at least, and also on 

 other species of algae such as those of Mesogloia, Leathesia, Scyto- 

 siphon, Chorda, Ralfsia, etc. It occurs at times so abundantly as to 

 discolor the host, but often is to be found in small quantity, giving 

 no outward (or macroscopic) indication of its presence. 



26. Entocladia Reinke 



Plants microscopic, composed of creeping, irregular, much 

 branched filaments, without hairs, growing on or within aquatic 

 plants ; groAvth mostly bj' division of terminal cells ; chromatophore 

 a parietal band with one or more pyrenoids; reproduction by 2- 

 4-ciliated zoospores. 



