Marine Plants of Nha Trang — Dawson 
This species is apparently most closely re- 
lated to Gymmgongrus tenuis J. Ag. of the 
Caribbean, with which it agrees in size, flat- 
ness of frond, in transectional structure, prom- 
inent cystocarps and superficial antheridia. It 
seems to occupy a similar habitat on exposed, 
surf-beaten rocks. It differs in its remotely 
branched, often subsimple, ligulate blades 
(compare B0rgesen 1919: 357, fig. 352) and 
its very prominent, hemispherical rather than 
flattened cystocarps. 
Since the above was written this species has 
been found in the flora of Isla San Benedicto 
in the Revillagigedo Archipelago on the east 
side of the Pacific Ocean (Dawson 12058, 
Nov. 17, 1953). 
Gigartina intermedia Suringar 1870: 30, pi. 
17B (Nagasaki, Japan); Okamura 1908, 
leones 1, pi. 35, figs. 1-5; Tseng 1936^: 49 
Fig. 52^ 
LOCAL DISTRIBUTION: Forming low, pul- 
vinate masses to 0. 8-1.0 cm. high, Sta. 8 
(11267). 
Although my plants are sterile, they agree 
well in habit and structure with this species 
known hitherto from Japan and Amoy, China. 
Catenella nipae Zanardini 1872: 143, pi. 6, 
fig. Al-7 (Borneo); Tseng 1942^: 143, fig. 2 
Fig. 52/ 
LOCAL DISTRIBUTION: Creeping, closely at- 
tached and overlapping on roots of man- 
groves, Sta. 12 (11391). 
Champia parvula (Ag.) Harvey 1853: 76. 
Chondria parvula C. Agardh 1824: 207 
(Cadiz, Spain) 
Fig. 52c 
LOCAL DISTRIBUTION: Small clumps about 
1 cm. high, Sta. 8 (11260). 
Champia vieillardii Kiitzing 1866, Tab. 
Phyc. 16, p. 14, pL 37e, f (New Caledonia) 
Figs. 52c, 53 
443 
Fig. 53. Champia vieillardii: Habit, as reproduced 
from Kiitzing’s Tabulae Phycologicae. 
LOCAL DISTRIBUTION: Attached to coral 
fragments in shallow water, Sta. 13 (11436). 
Although this name was reduced by De 
Toni (1900: 561) under Champia compressa 
Harv., the present material strongly suggests 
that this action was in error. Kiitzing’s figure 
37e shows a tripinnate plant of apparently 
semi-prostrate habit with abundant, short, ul- 
timate pinnules. In these characters as well as 
in size and aspect my plants are identical with 
his. Champia compressa differs in its more 'erect 
habit, less strongly compressed thallus, more 
remote and longer ultimate branches (see 
Harvey 1847, pi. 30). My plants also show 
features which were only partially indicated by 
Kiitzing, namely, the slender, subterete char- 
acter of some of the longer of the ultimate 
branches as well as basal ones, and their 
service in attachment by growing down to the 
substrate or to other portions of the plant and 
forming small adherent discs. 
Antithamnion sp. 
Fig. 54c, d 
LOCAL DISTRIBUTION: Forming a fine pink- 
