Marine Plants of Nha Trang — Dawson 
427 
this plant. They are 350-400 ju in diameter and 
low convex when superficial. The form and 
structure of this plant compare well with some 
of the writer’s Mexican collections. The slen- 
der, irregularly forked, erect branches arise 
from a rather thin crust whose margins are 
sometimes slightly free and undulate. 
Lithophyllum okamurai Foslie 1900: 4 
(Sagami, Japan); Foslie, in Weber van 
Bosse and Foslie 1904: 59, ph 11, figs. 
Fig. 39^ 
LOCAL DISTRIBUTION: In shallow water, Sta. 
7 (11240). 
The single specimen at hand appears to 
correspond with the Indonesian and Japanese 
plants figured by Foslie under this name. It 
shows a few low, domoid carposporic con- 
ceptacles about 170 ju in diameter, but spor- 
angia were not seen. As Foslie has indicated 
in 1904 this species is not clearly distinguish- 
able from plants under several other names 
such as L. racemus, L. kalsern, L. pallescens, L. 
fasciculatum, L. ajfine, and L. andrussowii. 
Much careful study will be required before 
satisfactory specific limits can be assigned 
among the species of this complex, 
Lithophyllum samoense Foslie 1906: 20 
(Samoa); Foslie 1929: 38, pi. 53, fig. 19 
Fig. 40^ 
LOCAL DISTRIBUTION: Growing as a thin 
crust on an old coral fragment, Sta. 10 
( 11338 ). 
Fig. 38. a-c, Lithothamnium erubescens var. subflabellata: a, b. Two specimens of 11439, a seen from above, b, from 
below, X 1; c, a more openly branched example of 11381, X 1. d, Lithophyllum trichotomum: Habit, X 1. 
