Bolbocoleon 227 



VII. BOLBOCOLEON Pringsheim, Phys. Abhand. Konigl. 

 Akad. Wiss. 1862 : 8. pi. 1. 1863. Huber, Ann. Sci. Nat. Bot. 

 VII. 16: 308-311.//. ij.f. 8-12. 1892. 



Thallus microscopic, epiphytic, consisting of a more or less 

 branched creeping filament of irregularly shaped cells on which 

 are borne smaller bulb-shaped cells (representing branchlets), the 

 latter produced at the summit into a tube from which grows a long 

 flagelliform hair. Chromatophore, in the larger cells, a parietal 

 sieve-like layer containing 5-10 pyrenoids ; in the smaller pilifer- 

 ous cells, an irregularly toothed plate with two pyrenoids. 



Asexual (?) reproduction by means of biciliate zoospores, pro- 

 duced in large numbers in the vegetative cells. 



Type (and only species) B. piliferum Pringsh. Inhabitant of 

 salt water. [Etym. floods, a bulb, and xoleov, sheath.] 



1. Bolbocoleon piliferum Pringsheim, /. c. Farlow, Marine 

 Algae, 57. 188 1. Hauck ; Rabenh. Krypt. Flor. Deutsch. 2 : 

 465./. 20/. 1885. Reinbold, Schrift. Naturw. Ver. Schles.- 

 Holst. 8: 138. 1889. DeToni, Syll. Alg. 1: 211. 1889. 

 Huber, /. c. Wille ; Engler & Prantl, Nat. Pflanzenfam. I 2 : 

 96./. 60. 1890. 



Vegetative cells 12— 16 fi thick, subcylindrical and 2—3 times as 

 long as the diameter, or somewhat conical. 



Epiphytic among the cortical cells of Leathesia tiiberiformis, 

 Chordaria divaricata, etc., in summer. 



Newfoundland : Grand Bay, near channel, on Castagnea vir- 

 escens, 1 August 1901 (M. A. Howe). 



Maine : Cape Rosier, on Ralfsia Borneti, July, 1 900 (F. S. 

 Collins). 



Massachusetts : Swampscott, on Ralfsia Borneti, 2 April 1891 

 (F. S. Collins); Nahant, on Castagnea virescens y 12 July 1884 

 (F. S. Collins); "Woods Holl, Gloucester" (W. G. Farlow).' 



Rhode Island : Newport, on Castagnea virescens, 1 8 June 

 1883 (F. S. Collins). 



California : San Pedro Bay, on Nemalion Andersonii, Novem- 

 ber, 1898 (Miss S. P. Monks). 



There is no apparent reason why this species should not be 

 found in Long Island Sound and New York Bay, but careful 

 search in these places has been fruitless. 



