448 
PACIFIC SCIENCE, Vol VIII, October, 1954 
Ceramium gracillimum var. byssoideum 
(Harv.) G. Mazoyer 1938: 323. Ceramium 
byssoideum Harvey 1853: 218 (Key West, 
Rg.53.,/ 
LOCAL DISTRIBUTION: Epiphytic, 2 mm. 
high or less, on Amphiroa from 2-3 m., Sta. 
2 (11378); epiphytic on Gracilaria, Sta. 4 
(11192a). 
Vegetatively the present material corres- 
ponds well with Ceramium masonii Dawson 
(1950^) of Pacific Mexico, but the strongly 
projecting, involucrate tetrasporangia are sec- 
und and adaxial as in C. gracillimum var. hys- 
soideum which Feldmann-Mazoyer, in B^r- 
gesen (1952), has reported from Mauritius. 
Ceramium mazatlanense Dawson 1950^: 
130, pi. 2, figs. 14, 15 (Mazatlan, Mexico) 
Fig- 55g-y 
LOCAL DISTRIBUTION: Tufted on rocks, Sta. 
2 (11082); epiphytic on bits of Diplanthera 
in drift, Sta. 3 (11102a); on old Amphiroa, Sta. 
1 (11129a); among other small algae on rocks, 
Sta. 11 (11405); Sta. 6 (11449). 
The present specimens include all repro- 
ductive phases and correspond closely (par- 
ticularly tetrasporic examples) with the type 
material of this species from Mexico. The 
cortical bands tend to be slightly thicker in 
some specimens than in the type, and the 
cortical cells accordingly more numerous, but 
the tetrasporic plants of 11405 are quite in- 
distinguishable from the type. Although most 
of the specimens are small, under 5 mm. high 
like the type, those of 11449 are luxuriantly 
developed, up to 2 cm. high. 
This species may prove to be identical with 
Ceramium cruciatum Collins & Hervey to which 
it shows considerable resemblance except for 
the elongated cortical cells. 
Ceramium clarionense Setchell and Gard- 
ner 1930: 170, pi. 7, figs. 25-27 (Revil- 
lagigedo Archipelago); Dawson 1950^: 
134, pL 4, fig. 29 . Ceramium aduncum Naka- 
mura 1950: 158, fig. 3a-g 
Fig. 53k 
LOCAL DISTRIBUTION: Epiphytic on old 
Liagora, Sta. 1 (11129). 
Only a few small antheridial and tetrasporic 
plants were found, up to 1 cm. tall, but they 
show the strongly drcinate tips, the emergent 
adaxial sporangia, and the deeply staining 
exudation droplets characteristic of this spe- 
cies. Nakamura has reported this plant from 
Formosa and northward to Japan under the 
name C. aduncum, 
Ceramium procumbens Setchell and Gard- 
ner, prox. Dawson 1950^: 128 
Fig. 56c, d 
LOCAL DISTRIBUTION: Epiphytic on the sur- 
face of small algae taken from coral in 2-3 
m., Sta. 2 (11373); creeping on small algae 
in drift, Sta. 3 (11102). 
The present rather scant material agrees in 
size, creeping habit, and tetrasporangium pro- 
duction with this Pacific Mexican plant, but 
does not show the opposite branching usually 
characteristic of Ceramium procumbens. Erect, 
simple branches often arise, however, at the 
nodes opposite the frequent rhizoids by which 
the extensive, creeping, prostrate filaments 
are attached. The identification should be 
considered tentative until the branching of 
more representative Asiatic specimens can be 
examined and compared with that of eastern 
Pacific plants. 
Ceramium maryae Weber van Bosse 1923: 
324, figs. 117, 118 (Kawasa, Paternoster 
Islands, Indonesia) 
Fig. 56g-/ 
LOCAL DISTRIBUTION: Epiphytic on larger 
algae and mixed in tufts of Pterocladia, Sta. 6 
(11227). 
My plants agree well with Weber van 
Bosse’s description in size, creeping habit of 
the primary branches, rhizoidal attachment, 
non-dichotomous branching, and immersed 
