Pacific Species of Antith amnion — Tokida and INABA 
121 
the pinnae, while it resembles in this respect 
A. Miharai Tokida (Tokida, 1942: 90, text 
figs. 5 and 6). The last-mentioned species 
differs from our new species in having tetra- 
sporangia not only on the lowermost cell but 
also on two succeeding cells. The most strik- 
ing character of the present species seems to 
be that the tetrasporangia are arranged in a 
longitudinal row along each side of the axis 
of branches. The cell next to the lowermost 
cell of pinnae rarely bears a sporangium. In 
the lower part of the frond a branch is pro- 
duced by the basal cell of a pinna, and some- 
times it lacks an adaxial pinna on its lower- 
most cell, while in the upper part of the 
frond a branch is formed directly from the 
axial cell of the main branch and is provided 
with a short basal cell which bears no pinna 
but occasionally bears a sporangium. The 
cell next to the basal cell of a branch in the 
upper part of the frond sometimes lacks an 
adaxial pinna. The pinnae are as a rule sim- 
ple, but rarely they bear a small pinnula on 
their lowermost cell. A pinnula of this kind 
is probably nothing but the beginning of a 
branch. 
Antith amnion cristirhizo phorum 
Tokida and Inaba, sp. nov. 
Figs. 3 a-d, 4 
Fronde ca. 5 mm. alta, sparse ramosa et 
opposite pinnata, repenti, rhizoidibus cristatis 
a cellulis basalibus pinnarum emittentibus 
ramis aliae algae ut Ceramii sp. et Gelidii 
suhcostati adfixa; ramis a cellulis basalibus 
pinnarum emittentibus, usque ad 120-150 g 
crassis, inferne cellulis diametro 1.5-3.5-plo, 
superne 0.5-2-plo, longioribus, cellulis api- 
calibus 8 g crassis; pinnis lanceolatis, cellulis 
ad septa leve constrictis, cellulis basalibus sub- 
quadratis et usque ad 64 g crassis, inferiori- 
bus diametro 1-2-plo longioribus et usque ad 
80 g crassis, apice subulatis, inferne pinnatis, 
superne inferiore latere pectinatis; pinnulis 
simplicibus vel raro semel divisis, inferne 
20-52 g crassis, cellulis diametro 1-1.5-plo 
longioribus, apice subulatis; cellulis glandu- 
linis numerosis, 22-40 g X 15-32 g, in pin- 
nulis brevioribus singulatim supra cellulas 
tres sitis; chromatophoris numerosis, disci- 
formibus. Fructus ignoti. 
Frond ca. 5 mm. high, sparsely branched 
and oppositely pinnate, creeping on the 
branches of other algae, such as Ceramium 
sp. and Gelidium suhcostatum, by means of 
crested rhizoidal filaments arising from the 
basal cells of pinnae; branches produced from 
the basal cells of pinnae, up to 120-150 g 
diam., with lower cells 1.5-3. 5 and upper 
cells 0.5-2 diam. long, and apical cells 8 g 
diam.; pinnae lanceolate, slightly constricted 
at septa, the basal cells being subquadrate 
and up to 64 g diam., lower cells being 1-2 
diam. long and up to 80 g diam., subulate 
at apices, pinnate below, pectinate on the 
lower side in the upper portion; pinnulae 
simple or rarely once divided, 20-52 g diam. 
below, with cells 1-1.5 diam. long, subulate 
at apices; gland cells abundant, 22-40 g X 
15-32 g, sitting singly over three cells on 
short pinnulae; chromatophores numerous 
discs. Reproductive organs unknown. 
Japanese name: Fusane-kasanegusa 
(nom. nov.). 
Type: Epiphytic on other algae, e.g., Geli- 
dium suhcostatum Okamura and Ceramium 
sp., Shirahama, Prov. Boshu. T. Inaba 350 , 
Mar. 11, 1944 (Herbarium, Dept. Fish., 
Hokkaido Univ.). 
This species of Antithamnion is one of 
those bearing gland cells of the scaphoid 
type, or those resting laterally on two or three 
cells. The frond is repent on the thallus of 
other algae, such as Gelidium suhcostatum 
and Ceramium sp., and is attached by means 
of short crested rhizoidal filaments arising 
from the lowermost cells of pinnae. The 
pinnae and pinnulae are lanceolate, being 
sharply acute at the apex, somewhat thick- 
ened in the middle portion, and slightly at- 
tenuated toward the base. The pinnulae are 
