Marine Plants of Nha Trang — Dawson 
421 
LOCAL DISTRIBUTION: Forming tufts to 1.5 
cm. high on small, sedentary molluscs, Sta. 
2 (11086). 
Gelidium crinale var. perpusillum Piccone 
and Grunow, in Piccone 1884/^: 317 (Red 
Sea); Weber van Bosse 1921: 225 
Fig. 5le, f 
LOCAL DISTRIBUTION: Forming a coarse vel- 
vet on mangrove roots, Sta. 12 (11396). 
This tiny plant, reaching a maximum of 3.5 
mm. in height, has abundant rhizoidal fil- 
aments in the medulla and seems to agree 
fully . with the description of this minute 
variety of G. crinale. 
Gelidium divaricatum Martens, prox. Mar- 
tens 1866: 30, pL 8; Okamura 1901, Illust. 
pi. 2; Tseng 1936^: 36, pi. 4, fig. 18a, b 
Fig. 32^^ 
LOCAL DISTRIBUTION: Growing in dense 
tufts to 1.5 cm. high, Sta. 6 (11451). 
These plants agree in stature and in branch- 
ing with this small species, but are flatter and 
with more attenuation of some of the branches 
than either Japanese or Chinese specimens. 
The internal structure is agreeable either with 
Gelidium or Pterocladia, and, in the absence of 
cystocarpic examples, this determination must 
be considered only approximate. 
Gelidium pulchellum (Turn.) Kiitz., prox. 
Feldmann and Flamel 1936: 119, fig. 23, 
pi. 1, figs. 2, 3 
Fig. i2b 
LOCAL DISTRIBUTION: Sta. 4 (11203). 
This tetrasporic material shows similarity 
to some of the Mediterranean variants of 
Gelidium pulchellum in its stature, compressed 
axes, and pinnate branching. The tetrasporic 
branchlets are simple and lanceolate, unlike 
those of G. crinale^ but their acute apices and 
lack of a sterile margin do not permit them 
to be assigned to G. pulchellum without query. 
Additional Indo-Pacific material must be ex- 
Fig. 32. Gelidium divaricatum, prox.: Habit, X 2.5. 
h, Gelidium pulchellum, prox.: Habit, X 3.6. 
amined to determine the range of variability 
and proper affinities of this small plant. It 
shows some resemblance to G. pseudointri- 
catum Skotts. & Levring (Levring, 1941: 635). 
Pterocladia parva Dawson 1953: 77, pi. 6, 
fig. 2 (Gulf of California) 
Fig. 33^-f 
LOCAL DISTRIBUTION: Growing as a dense 
turf about 1.5 cm. thick on rocks, Sta. 6 
(11223); forming a turf 4-6 mm. thick on 
coral fragments, Sta. 10 (11348); sparsely 
tufted on rocks, Sta. 10 (11326). 
Although there is considerable variation in 
branching among these three collections, 
their size, habit, morphology, and structure 
are in good agreement with the Mexican type 
and paratype material. 
