Ser. RHOopOSPERMES. Fam. Rhodomelec. 
Puate CCXXIV. 
DASYA ARBUSCULA, 4. 
Gey. Cuar. Frond filamentous; the stem and dranches mostly opake, 
regulary cellular (rarely pellucid, longitudinally tubed), composed 
internally of numerous parallel tubes surrounding a central cavity ; 
the ramuli jointed, single tubed. Fructification two-fold, on distinct 
plants; 1, ovate capsules (ceramidia) furnished with a terminal pore, 
and containing a tuft of pear-shaped spores; 2, lanceolate pods (sti- 
chidia), contaming ¢etraspores ranged in transverse bands. Dasya 
(4g.), from dacvs, hairy. 
Dasya arbuscula ; stems much and irregularly branched, beset on all sides 
with short, divaricating, dichotomous ramuli, scarcely tapering 
upwards; articulations from two to four times longer than broad ; 
apices spreading, rather obtuse ; stichidia elliptic-oblong, mucronate ; 
ceramidia urceolate, with a long, cylindrical neck. 
Dasya arbuscula, 4g. Sp. Alg. vol.ii. p.121. J. Ag. Symb.p. 33. J. Ag. 
Alg. Medit. p.118. Harv. Man. p.98. Endl. 3rd Suppl. p. 44. Mont. 
Ann. Se. Nat. vol. xv. p. 173. 
Dasya Hutchinsie, Harv. in Hook. Br. Fl. vol. ti. p. 335. Harv. m Mack. 
Fl. Hib, part 3. p. 210. 
Creramium Boucheri, Duby, 2nd Mem. p.15. Crouan, in Desm. Pl. Crypt. 
no. 302 and 303. 
ConFERvA arbuscula, Dill. t. G. (but not t. 85). 
Has. On rocks, at the verge of low water-mark ; a more slender variety 
frequently dredged in from four to six or eight fathoms water. 
Annual. Summer. Not uncommon on the shores of the West of 
Treland, and the North and West of Scotland. Particularly fine in 
Bantry Bay, Miss Hutchins. Rare in England. Salcombe, and the 
Land’s End, Mr. Raifs. Mewstone, Plymouth, Rev. W. 8. Hore. 
Geogr. Distr. Atlantic Shores of France and Spain. Mediterranean Sea. 
Descr. Root, a small disc. Fronds from one to three or four inches high, as 
thick as hog’s bristles, irregularly much branched in a manner between 
alternate and dichotomous; sometimes all, the main divisions are pretty 
regularly dichotomous; sometimes regularly alternate; the lesser branches 
are generally alternate, much crowded to the apices, and decompound 
above, the whole habit of the plant being strikingly bushy. Stem and 
branches opake, inarticulate, marked with irregular cells. Ramuli densely 
covering all parts of the frond except the older parts of the stem, directed 
to every side, one to two lines long, somewhat rigid, of nearly equal diameter 
throughout, divaricate, several times forked, the axils patent, articulate, 
their articulations from two to four times longer than broad, cylindrical. 
Ceramidia (xather rarely formed) borne on short, inarticulate peduncles, 
surrounded by a few jointed ramuli, roundish-urceolate, the apex produced 
202 
~ 
