216 
THE SEAWEEDS 
CONSPECTUS OF THE SUBFAMILIES. 
I. — Apical cell mostly indistinct. Cystocarps out- 
wardly prominent. Lobes of the gonimoblast 
closely coalescing Nitophylleae. 
II. — Apical cell conspicuous, transversely articulated 
at the apex of the vegetative frond. 
1. Tetrasporangia evolved in both surfaces 
of the frond. Cystocarps mostly 
prominent on both faces Delesserieae. 
2. Tetrasporangia in special stichidia or 
otherwise conspicuous. Cystocarps 
stout, sub-globose prominent Sarcomenieae. 
Subfamily Nitophylleae (Naegeli) Schmitz. 
CONSPECTUS OF TIIE GENERA. 
A. — Frond broad, flabellate, leaf-like, proliferating 
from the margins, fenestrated 
B. — Frond flat, foliaceous, continuously mem- 
branaceous. 
1. Cortical cells sub-hexagonal. Sori 
definite, scattered 
2. Cortical cells arranged in twos or fours, 
like those of Porphyra. Sori showing 
minute scattered dots 
3. Cortical cells sub-cubical. Frond thick 
and coarse. Sori in linear furrows 
within the margin 
MARTENSIA Tiering. 
Frond flat, simple or dichotomous, or divided into lobes from the base, 
segments rounded flabellate, the lower area of each areolate-cellular, con- 
tinuous, the upper forming a network of longitudinal and horizontal 
trabeculae. Some fronds prolificate from the margin, the new segments 
also with continuous lower area and trellised upper area. Cystocarps 
sessile on the walls of the trellis, solitary, scattered, globose; pyriform 
spores at the ends of threads radiating from a central placenta, within a 
cellular pericarp. Tetrasporangia sub-seriate in the walls of the trellis, 
triangularly divided. 
Cape of Good Hope, Ceylon, Friendly Islands, and Australia. 
Martensia denticulata Harvey. 
Repeatedly dichotomous, 5 cm. to 8 cm. high, the upper margin toothed or 
lobed. Colour when fresh a greenish-purple, irridescent; on exposure to the 
air or in fresh water becoming rosy or blood-red. 
South-West Australia. 
Martensia Hering. 
Nitophyllum 
Greville. 
Platyclinia 
J. Agardh. 
Pachyglossum 
J. Agardh. 
