56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



Bonnemaisonia hamifera. They have based their hypothesis on two evi- 

 dences, (1) the great resemblance of Trailliella to the known tetras- 

 porophyte of Bonnemaisonia asparagoides (Woodw.) Ag., namely Hy- 

 menoclonium serpens (Crouan) Batters, and (2) the fact that Trailli- 

 ella made its appearance as an introduction to the Atlantic coasts of 

 Europe and the United States at about the same time as Bonne?naisonia 

 hamifera. 



Bonnemaisonia hamifera has been reported only from a few localities 

 along the Pacific Coast of North America, all south of N. Lat. 35° (see 

 above) and Trailliella intricata has heretofore been reported only from 

 Friday Harbor, Washington (Kylin, 1925). Consequently, nothing can 

 be added in this account as to the relationships between these two plants. 

 However, it may be pointed out that should the Feldmann hypothesis 

 prove to be correct, the Trailliella reported from Washington may be 

 shown to be related rather to Bonnemaisonia nootkana (Esper) Silva 

 (=5. calif ornica Buffham) which is the species inhabiting that region. 



Trailliella intricata has recently been collected intertidally 10 and 

 17 miles west of Punta Malarrimo, Baja California (D. 9904, 9921, 

 10077, 10451), and has been found epiphytic on Sargassum dredged 

 from 6-20 meters at Isla Guadalupe (D. 8231). In both of these areas 

 Bonnemaisonia is as yet unknown. In an analysis of the geographic dis- 

 tribution of these two plants it should further be borne in mind that 

 even should T. intricata and B. hamifera prove to be alternate genera- 

 tions of a single species, each may at times be reproductively independent 

 of the other. The Mexican specimens of B. hamifera examined by the 

 writer have all been sterile, but apparently capable of reproduction by 

 vegetative fragmentation and reattachment by the hamate branchlets. 

 Trailliella, wherever it is found, is nearly always reported as sterile. 



For the aid of future investigators of this problem the Mexican 

 Trailliella is briefly described : Thalli epiphytic on other algae, scattered 

 and sparse, or forming more or less hemispherical, soft, delicate, pink- 

 colored tufts 1-2 cm. in diameter, consisting of irregularly multifariously 

 branched uniseriate filaments 25-28 /x in diameter of cells 1.5-2.5 times 

 as long as broad, slightly constricted between successive cells, commonly 

 with a small, thickly wedge-shaped gland-cell 9-12 fi in diameter be- 

 tween the edges of, and taking the place of part of the constriction 

 between two successive cells, alternately on one side and then the other, 

 but some parts of filaments without such gland cells; reproduction not 

 observed. 



