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PACIFIC SCIENCE, Vol. XI, January, 1957 
lateribus ambis corio cellulis minoribus an- 
guloris ad 10 /x diametro, tetrasporangiis 
cruciatis ovatis ca. 40 /jl longis in involucris 
valde inflatis eis ex vittis nodoris proxime 
juxtaposis axilarum erectarum acropetaliter 
productis, loculis fertilibus terminalibus 220- 
250 {jl diametro eis Equisetum similantibus. 
TYPE: Dawson 13620a, growing within 
tufts of Ectocarpus breviarticulatus near the 
margin of the seaward reef opposite EMBL, 
Parry Island, August 19= 
This material is nearest to Ceramium naka- 
murai Dawson from Garanbi, Formosa (C 
equisetoides Nakamura), but is not dichotom- 
ously branched. It is identical with tetraspor- 
angial specimens cited and illustrated by the 
writer as a probable undescribed species from 
Isla San Benedict©, Mexico (Dawson 1954a: 
6, pi 4, fig. 2). 
Ceramium gracillimum var. byssoideum (Harvey) 
G. Mazoyer; Dawson 1954: 448, fig. 55e, f; 
Dawson 1956: 53; Taylor 1950: 138 (as 
Ceramium byssoideum Harvey) 
D. 13616, 13707, 13715, 13790, 13831, 
13860, 13891, 13924, 13916, 13951, 14028. 
Ceramium mazatlanense Dawson; Dawson 
1954: 448, fig. 55g-j; Dawson 1956: 53 
D. 13752, epiphytic on Caulerpa. 
Ceramium serpens Setchell and Gardner ?; 
Dawson 1956: 54, fig. 53 
D. 13610b, 13857. Both are sterile and not 
positively identified. 
Ceramium taylori Dawson; Dawson 1954: 446, 
fig. 55b, c 
D. 13637, epiphytic on Udotea , 13817, 
13942. 
Centroceras apiculatum Yamada; Dawson 1956: 
55, fig. 55 
D. 13941a, 14016. 
Centroceras clavulatum (C. Agardh) Montagne; 
Dawson 1954: 446, fig. 54b; Dawson 1956: 
55; Taylor 1950: 139 
D. 13639, 13794, 13808, 13838, 13958 (this 
latter collection consists largely of f. inerme 
(Kutzing) Piccone. P. 52-29, Aomon Is. 
shore rocks, 10/22/52. 
Centroceras minimum Yamada; Dawson 1956: 
54, fig. 54 
D. 13640a, 14009a. 
Spyridia filamentosa (Wallen.) Harvey; Dawson 
1954: 444, fig. 347. j; Dawson 1956: 56; 
Taylor 1950: 139 
D. 13677, 13816, 13884, 13911. P. 1163, 
Mui Is. lagoon, 4/11/54; P. 1190, Bokanjoio 
Is. lagoon, 4/14/54. 
Hypoglossum minimum Yamada 1936: 138, fig. 
2A--D (Naha, Okinawa) 
Fig. 30c 
D. 13704, 13755, 13901, 13999d. These 
show considerable variation in form and 
habit. Those under 13999d, epiphytic on 
Halimeda from a depth of 135 feet, are most 
like Yamada 4 type. 
Fig. 28. Hemitrema fragilis: Habit of dry plants of 
D. 13801, X 1.3. 
