226 
THE SEAWEEDS 
PLATYCLINIA J. Agardh. 
Frond flat, foliaceous, more or less lobed or dissected, membranaceous, the 
upper parts consisting of three, the lower of more layers. The innermost 
cells a little larger, the middle shorter, the outermost shorter by half, 
arranged in twos or fours after the fashion of Porphyra. Ribs and micro- 
scopic veins are wanting. Cystocarps sub-immersed, scattered, depressed, 
with the carpospores in chains. Tetrasporangia rather small, scattered. 
Cape Horn, Campbell Island (New Zealand), Australia. 
Platyclinia stipitata (Harv.) J. Agardh. 
Frond with a stipe 2 cm. to 3 cm. long, dilated above into a fan-shaped 
lamina, 5 cm. to 10 cm. in expansion, upper segments pedatifid with 
lanceolate-linear laciniae. Substance mucous. Colour rosy-red. 
South Australia (Port Elliot), Tasmania. 
Platyclinia purpurea J. Agardh. 
Frond with sub-dichotomous, acuminate laciniae. To 30 cm. high, with 
laciniae 10 cm. to 15 cm. long. At the base 2 cm. to 5 cm. wide. Colour 
dark-purple. 
South Australia (Hussey). 
PACHYGLOSSUM J. Agardh. 
Frond flat, thick, of several layers of cells. Sori of tetraspores in linear 
furrows within the margins of the frond. Cystocarps sub-singly scattered 
in the intra-marginal region. Thallus borders smooth, without teeth. 
Pachyglossum Engelhardtii J. Agardh. 
Fronds linear, lanceolate prolificating from the margin ; conspicuously 
attenuated at the base and apex. Colour rosy. 
South Australia (Eastern Bays). 
Pachyglossum Hussey anum J. Agardh. 
Fronds proliferous, with lanceolate-linear leaflets, although several 
leaflets approximate in rosettes. 
South Australia (Port Elliot, Eastern Bays). 
Subfamily Delesserieae (Kutzing) Schmitz. 
CONSPECTUS OF GENERA. 
A. — Sori of tetrasporangia evolved in special leaves (sporophylls) . 
a. No transverse veins. 
1. Very thin, delicate, membranous. Con- 
spicuous midrib. Cystocarps over the 
midrib. Sori of tetrasporangia in the 
sporophylls prolificating on each side of 
the midrib Hypoglossum 
Kutzing. 
