Ser. RHODOSPERME®. Fam. Ceramiee. 
Puate CCCXIII. 
CALLITHAMNION VIRGATULUM, JZav. 
Gen. Cuar. Frond rosy or brownish-red, filamentous ; stem either opake 
and cellular, or translucent and jointed; branches jointed, one-tubed, 
mostly pinnate (rarely dichotomous or irregular) ; dissepiments hyaline. 
Fruit of two kinds, on distinct plants : 1, external ¢e¢raspores scattered 
along the ultimate branchlets, or borne on little pedicels; 2, round- 
ish or lobed, berry-like receptacles (favel/e) seated on the main 
branches, and containing numerous angular spores. CALLITHAMNION 
* (Lyngb.),—from kaos, beauty, and @apnov, a little shrub. 
CaLLITHAMNION virgatulum ; rose-red, minute, tufted, much branched ; 
branches long and straight, erecto-patent, alternate or secund ; ramuli 
from every joint, short, obtuse, mostly secund ; articulations thrice 
as long as broad ; tetraspores scattered along the branches. 
CaALLITHAMNION virgatulum, Harv. in Hook. Br. Fl. vol. ii. p. 349. Wyatt, 
Alg. Danm. No. 189. 
CALLITHAMNION Daviesii, var., Harv. Man. ed.1. p. 117, ed. 2. p. 184. 
Has. Parasitical on Ceramium rubrum, m pools between tide-marks. 
Torquay, Mrs. Griffiths. 
Groer. Distr. 9 
Descr. Filaments from two to four lines high, erect, forming little pencil-like 
tufts, or clothing the stems of the Ceramium continuously, in patches 1-2 
inches in line, much branched. Branches ercct, or erecto-patent, long, 
straight or gently curved, rod-like, with a few scattered similar secondary 
branches, which are either alternate or secund. Aamuli springing from 
nearly every joint of the primary and secondary branches, mostly secund, 
sometimes two together, very short, usually consisting of a single cell, obtuse. 
Tetraspores (formed from altered ramuli) scattered plentifully along the 
branches, secund or two together, either sessile or raised on little stalks. 
Colour a fine, clear, rosy red, preserved in drying. Substance membrana- 
ceous, delicate. The plant adheres closely to paper. 
ve aa anid 
If we confine our attention to specimens that strictly answer 
to the characters illustrated in this and the following plate, 
C. virgatulum and C. Daviesii appear. to be very distinct one - 
from the other, and easily recognized at a glance :—the former 
VOL. III. U 
