164 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



In Structure these plants agree in general with L. conferta Setchell 

 (1912, p. 252), except that in the writer's authentic specimens of that 

 species no invasion of the axial siphon by filaments appears, nor did it 

 appear in his specimens of L. Binghamiae J. Ag. or L. peruviana Howe, 

 both larger and flatter species. It is a more delicate plant than L. conferta, 

 nearly free from proliferations. A somewhat similar structure is shown by 

 Cryptosiphonia fVoodii J. Ag. (Phyc. Bor.-Amer. 449; Kylin 1925, p. 

 14) , but the filamentous investment of the axial cell row is more extensive 

 than in our plant, and the outer medulla less clearly parenchymatous, and 

 of relatively smaller cells. 



Mexico: Baja California, dredged ofif Point Hughes, Cabo San 

 Lazaro, no. 34-603 (TYPE), 7 Mar. 1934. 



Rhizophyllidaceae 



Plants crustose or erect and bushy; if crustose, structurally with a 

 basal layer supporting a cortex of erect assimilatory filaments, if erect, 

 with an axial strand of longitudinal filaments forming a medulla and 

 radial assimilatory cortical filaments, rather closely united into a firm 

 thallus; tetrasporangia terminal on the corticating filaments; carpogenic 

 branches and auxiliary branches in nemathecia, giving rise to crowded 

 cystocarps. 



OGHTODES J. Agardh, 1872 



Ochtodes Grockeri Setchell & Gardner 



Plants to 15 cm tall, bushy, red, firm in texture, moderately to densely 

 alternately branched, especially densely in the slender tapering upper 

 divisions, where the branching may be subdichotomous ; spreading below, 

 but above either spreading or erect ; cylindrical throughout or compressed 

 slightly below the forks, about 2 mm diam. near the base, 0.5-1.0 mm in 

 the branchlets, the tips acute; structurally showing growth from an apical 

 cell, developing an axial cell row, generally distinct, which in the lower 

 parts may in places show as one, occasionally two or even three very thick- 

 walled cells in the middle of the pseudoparenchymatous medulla, but this 

 row sometimes little different from the neighboring cells ; outer medulla 

 and cortex clearly filamentous, the filaments closely placed, the last divi- 

 sions radially placed and the outer cells columnar; large refractive 

 (mucus?) cells common in the inner cortex; cystocarps seriate, common 

 on the secondary or lesser branches, strongly laterally projecting, about 

 0.2-0.6 mm diam. 



