Marine Plants of Nha Trang — Dawson 
393 
Caulerpa serrulata (Forsk.) J. Ag. emend. 
Bprgesen 1932^: 5, pi. 1, fig. 2; Tseng 
1936^: 178, pi. 1. Fucus serrulatus Forskal 
1775: 179 (Red Sea) 
Fig. 10a 
LOCAL DISTRIBUTION: Occasional in sandy 
places in 1-2 m., south side of wharf, Sta. 2 
(11387). 
These specimens represent the type variety 
serrulata of the species. 
Caulerpa racemosa var. macrophysa 
(Kiitz.) Taylor 1928: 101, pi. 12, fig. 3, pi. 
13, fig. 9. Chauvinia macrophysa Kiitzing 
1857, Tab. Phyc. 7, p. 6, pi. 15 II (Central 
America) 
LOCAL DISTRIBUTION : Specimens of a single 
collection seen: I.O.N. No. 16, lie de Tre, 
Aug. 1949. 
Bryopsis pennata Lamouroux 1809^: 134, 
pi. 3, fig. la, b (Antilles); Egerod 1952: 
37''’ fig- ^ Fig.ll^ 
LOCAL DISTRIBUTION: A few small plants 
to 13 mm. high on a coral rock dredged from 
5-7 m. near Sta. 8 (11275); to 1 cm. high 
among other small algae, Sta. 9 (11323). 
Pseudobryopsis mucronata Bprgesen, 
■ Fig. 11^ 
LOCAL DISTRIBUTION: Among other minute 
algae on bits of debris, dredged from 2-3 m., 
Sta. 2 (11296). 
The several plants examined are sterile. 
They reach somewhat over 1 cm. in height 
with much-branched axes to about 120 ^ in 
diameter. The slender, multifarious branches 
and discoid chromatophores about 6 ju in 
diameter bearing distinct pyrenoids are much 
like those of P. mucronata Bprgesen (1930: 
163, fig. 7) from Bombay, although that spe- 
cies becomes as much as 5 cm. high. It is 
presumed that the present sterile specimens 
are immature examples. 
Pseudobryopsis parva sp. nov. 
Fig. lid, e 
Thallis 5-7 mm. aids, e pluribus axibus 
simplicibus, pinnis radialiter ordinatis in dim- 
idiis superioribus infixis; adnexione ope rhiz- 
oidum; axibus circiter 100 /z diametro ad 
basim, ad 20-15 m ad apicem deminutis, infra 
nudis; pinnis paulo sparsis, baud regulariter 
radialiter positis, circiter 1.0-1. 5 mm. longis, 
simplicibus, plerumque circiter 20 ju diametro, 
leviter incurvis; gametangiis sessilibus, elon- 
gatis, circiter 190 ix longis, apicaliter sub- 
acutis cum poro terminali, plerumque singu- 
latim adaxialiterque prope basim pinnarum 
singularum fixis. 
Thalli 5-7 mm. tall, consisting of several 
simple axes beset in their upper halves with 
radially arranged pinnae; attachment by rhiz- 
oids; axes about 100 /x in diameter at the base, 
tapering to 20-15 m at the tip, barren below; 
pinnae rather sparse, irregularly radially placed, 
about 1.0-1. 5 mm. long, simple, mostly about 
20 iJL in diameter, slightly incurved; chloro- 
plasts obscure; gametangia sessile, elongate, 
about 190 IJL long, about 35 /x in diameter at 
the base, 50 n at the top, apically subacute 
with a terminal pore, usually borne singly and 
adaxially near the base of a pinna. 
TYPE: Holotype is Dawson 11375, Feb. 24, 
1953, in the U. S. National Herbarium. 
Type locality: On the surface of a dead coral 
fragment dredged from 2-3 meters depth off 
Cau Da, Nha Trang Bay. 
Six species of Pseudobryopsis have heretofore 
been recognized: P. myura (J. Ag.) Berth., 
P. mucronata B0rg., P. hainanensis Tseng, P. 
papillata Nasr, P. mauritiana B0rg., and P. 
oahuensis Egerod. All of these are discussed 
by Egerod (1952: 373-374). The present spe- 
cies is much smaller than any of the others 
and is distinguished by its delicate, simple 
axes, the relatively sparse pinnate branches. 
