236 
THE SEAWEEDS 
C. — Corticate, tall to 60 cm., flat and to an inch wide. 
Pinnate, the pinnae springing from within the 
margin. 
Sarcomenia delesserioides Sonder. 
Fronds tufted, 30 cm. to 90 cm. high, originating in an undivided lanceo- 
late leaf-like flat axis, of varying length, and breadth from 4 mm. to 4 cm., 
with an evident midrib. This primary frond emits from points 
within the margin numerous opposite pairs of similar fronds, the primary 
pinnae, these emitting similar secondary pinnae. Sometimes the ends of the 
branches end in long clasping tendrils. Pedicellate cystocarps scattered 
over both primary and secondary pinnae. Stichidia scattered, lanceolate, 
bearing a double row of tetrasporangia. Colour when growing a fawn- 
grey, rapidly changing in air or fresh water to a bright rosy-red. Sub- 
stance easily dissolved. 
Western Australia, South Australia (Cape Spencer), Victoria to Western 
Port. 
Fig. 100 . — Sarcomenia delesserioides : a , variety , latifzlia ; 
b, variety , passing into variety y ; c, section, 
to show the cellular structure; d, a ceramidium; 
e, spores from the same; /, a stichidium; g, a 
tetraspore. (After Harvey.) 
