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P l a t e CCCXXXI.
CALLITHAMNION AFFINE, Harv.
Gen. Chau. Frond rosy or b row n ish -red , filamentous ; s tem e ith e r opake
a n d cellular, o r tr a n s lu c e n t and jo in te d ; b ra n c h e s jo in te d , o n e -tu b ed ,
mostly p in n a te (rarely d ichotomous or irreg u la r) ; dissepiments h y aline.
F ru it of two k in d s , on d is tin c t p lan ts ; 1 , e x te rn a l tetraspores,
s c a tte re d a lo n g th e u ltim a te b ra n c h le ts or b o rn e on little p ed ic e ls ;
a , ro u n d ish o r lobed, b e rry -lik e receptacles (favelloe) seated on th e mam
b ran ch es a n d co n ta in in g n um e ro u s a n g u la r spores. Callithamnion
{ ly n g h ) ,— h om xaWos, heanty, an d bapviav, a little shrub.
C a l l i t h a m n i o n affine; much branched and bushy, th e stem rather opake,
full of veins ; secondary branches long, having a roundish outline,
alternately plumulate ; plumules very narrow simply pinnate ; pinnæ
short, erect, increasing in length upwards, alternate, crowded at to p ,
artionlations of the branches three or four times, of th e pinnæ once
and a half as long as broad ; tetraspores generally solitary, rising irom
the basal cell of tbe pinnæ.
C a l l i t h a m n i o n affine, H a n . in Hook. Br. FI. vol. ii. p. 3 4 4 . H a n . Man.
ed. l . p . 110. ed. 2. p. 180.
H a b . Parasitical on Fuci, between tide-marks. Annual. Summer. Shores
of Bute, B r . Greville.
G e o g b . D i s t k .
D e s o e Tufts tw o t o t h r e e in c h e s h ig h , w i th a s om ew h a t p y r am id a o u tlin e , th e “ T o w e r ( r a n c h e s b e in g lo n g e s t , t h e u p p e r g r a d u a lly s h o r t e r
a percurrent. nearly undivided stem, closely set, on all sides and throughout
its whole length, with lateral branches. These are once or twice divided
and clothed with very narrow, elongate, erect, and slender, simply pnnated
plumules, alternate, one rising from eveiy joint of the blanch
T o rt, erect, awl-shaped, the lowermost shortest and subdistant, the uppei
gi-adually longer and closer together, the teminal ones crowded and shoit.
stem full of slender veins, and sub-opake. its J j '; “ ® “
thrice as long as broad. AHiculations of the branches tto c e oi four times
as long as broad, with wide margins ; those of the pinnules about oncejmd
a half as long as broad. Tetraspores globose, and mostly solitary, a or
near the base of the pinnules. Favelloe in pairs, on shghtly distorted
branches, each faveUa occupying the place of a suppressed ramulus. Colou.i
a deep red, pretty well preserved in drying. Substance membranaceous.
In drying, the plant adheres closely to paper.
'Sill
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