Ser. RHoDOSPERME. Fam. Rhodomelee. 
Puate CCXXI. 
RYTIPHLZA THUYOIDES, Aare. 
Guy. Cuan. Frond filiform or compressed, pinnate, transversely striate, reti- 
culated; the axis articulated, composed of a circle of large, tubular, 
elongated cells (s¢phons), surrounding a central cell; the periphery 
of several rows of minute, irregular, coloured cellules. ruetification 
of two kinds, on distinct individuals; 1, ovate capsules (ceramidia), 
containing a tuft of pear-shaped spores; 2, ¢e¢raspores, contained in 
minute, lanceolate receptacles (stichidia) ina double row. RytrpHiHa 
(4g.),—from puris, a wrinkle, and pros, the dark, because the sur- 
face is transversely wrinkled or striate. 
Ryrreui#a thuyoides ; stems erect, rising from creeping fibres, terete ; 
below simple and set with short, spime-hke ramul; above much 
branched; branches alternate, very erect, bi-pinnate ; pinne multifid 
or pinnulate ; axils rounded ; ceramidia ovate, sessile, densely set. 
PotysipHonta thuyoides, Harv. in Mack. Fl. Hib. part 3. p. 205. Wyatt, 
Alg. Danm. no. 305. Harv. Man. p.86. EH. Bot. Suppl. t. 2882. 
GraMMita rigidula, Bonnem. 
Has. In pools left by the tide, growing either on the rocky bottom or on 
Corallines and other small Alge. Perennial. Summer. Abundant 
on the west coast of Ireland. Portrush, MW. Moore. Howth and 
Balbriggan, Miss Gower. Ayrshire coast, Mr. Thompson and Rev. D. 
Landsborough. South coast of England, Devonshire, Mrs. Griffiths. 
Mountsbay and Ilfracombe, Mr. Ra/fs. Jersey, Miss White. 
Geogr. Distr. Atlantic shores of Europe. 
Descr. Root, a widely spreading mass of creeping fibres. Fronds from three to 
six inches high, twice as thick as hog’s bristle, forming wide, but not very 
crowded tufts. Stems very variable in division : in some specimens nearly 
simple, with three or four long, rod-like branches, set with very short pin- 
nulate ramuli; in others naked at the base, but closely and regularly pin- 
nated or bipinnated from the middle upwards, the pinnz long and virgate, 
closely pinnulate. Other specimens are excessively bushy, the branches 
springing from the upper part of the stem in a very irregular manner. In 
all varieties the branches are remarkably erect, and generally straight, and 
more or less regularly pinnate or bipinnate. Ramuli below simple and subu- 
late, above pinnulate and forked, one or two lines long. The whole frond 
is marked with transverse striae at distances about equal to the diameter, 
and the surface is reticulated with anastomosing cells. Fructification ; 
ceramidia oblong-ovate, densely crowded on the ramuli, sessile, containing 
a tuft of pear-shaped spores. et¢raspores in distorted ramuli. Substance 
somewhat rigid, between cartilaginous and membranaceous. Colowr, a fine 
dark brownish purple, becoming more or less tinted with olive when ex- 
posed to sunlight. 
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