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THE SEAWEEDS 
Family SPHAEROCOCCACEAE (Dumont) Schmitz. 
CONSPECTUS OF THE SUBFAMILIES. 
A. — Cystocarps evolved in special ramuli. 
a. Cystocarps borne on summit of a short ramulus. 
Tetrasporangia zonately divided Phacelocarpeae 
(J. A g.J Schmitz. 
b. Cystocarps evolved in special wart-like ramuli. 
Tetrasporangia cruciately divided Stenocladieae 
Schmitz. 
B. — Cystocarps not evolved in special ramuli. 
c. Carpospore-bearing filaments of several coales- 
cing bundles of branches. 
1. Bundles of filaments dense, of equal 
height MelanthaUeae 
J. Agardh. 
2. Bundles of filaments lax, of unequal 
height Gracilarieae 
(Naeg.) J. Agardh. 
d. Cavity of cystocarp traversed by a loose net- 
work. Tetrasporangia zonately divided . . . . Ilypneae 
(J. Agardh) Harvey. 
Subfamily Phacelocarpeae (J. Agardh) Schmitz. 
PH ACELO CARPUS Endlicher and Dietrich. 
Frond compressed, alternately decompound pinnate, distichously pinnate 
(in Australian forms), composed of three strata surrounding a central axial 
articulated syphon; the medullary of longitudinal, densely interwoven fila- 
ments; the intermediate layer of roundish cells; the cortical of minute, 
coloured, vertically seriate cellules. Cystocarps pedicellate, between the 
teeth, round- or kidney-shaped, the upper part thickened, with a pore or 
slit. Nemathecia (packets of tetrasporangia) round- or egg-shaped, con- 
taining numerous cavities excavated under the surface-coating and bearing 
on their walls attached, linear or clavate, zonately divided tetrasporangia, 
not unlike the strings of spores of a coralline. With the spores are 
parenemata. 
A. — The aculei or teeth have a broad wing which margins the midrib of 
the rachis, the length of the teeth being about equal to the width of the 
rachis. 
