Calithamnion.] ALG.E CONFERVOIDE^. 347 



thick cartilaginous branched in every direction, penultimate 

 branchlets dense quadrifarious repeatedly dichotomous rouud- 

 topped, axils patent, apices short bifid, articulations of the 

 branches swollen at the joints thrice as long as broad. 



Torquay, Mrs. Griffiths. Kingston Harbour and Killiney, near Dub- 

 lin, W. H. Harvey. — 2 — 4 inches high, flaccid and spongy ; stems 

 shrubby; branches long, patent, thickly clothed with short, secondary 

 branchlets, about half an inch in length, which are again covered with a 

 third set of branchlets, spreading on all sides and giving the plant a 

 shrubby character, much resembling C. Arbuscula. Main articulations 

 veined. Capsules solitary, axillary, elliptical. Favcllcc roundish or 

 lobed. 



29. C. interruptum, Ag. (interrupted Calithamnion); " pur- 

 plish much branched forked capillary, joints four times as long 

 as broad, slightly swelling upwards, capsules on short lateral 

 stalks elliptical with a transverse separation." Sm — Ag. Sp.^Alg. 

 v. 2. p. 174. — Conferva interrupta, E.Bot.t. 1838. 



At Brighton, Mr. Borrer. — This, 1 believe to be nothing but a trifling 

 variety of the following. 



30. C. pedicelldtum, Ag. (stalk-fruited Calithamnion); tufted, 

 the branches long slender and little divided, beset with short 

 alternate sparingly dichotomous secondary ramuli, apices obtuse 

 scarcely tapered, articulations variable mostly very long, cap- 

 sules solitary axillary pedicellate. — Ag. Sp. Alg.v. 2. p. 174. — 

 Conferva pedicellata, E. Bot. t. 1817. Dillw. Conf. t. 108. 



Rather rare: Brighton, Mr. Borrer. Devonshire, Mrs. Griffiths. 

 Bantrv, Miss J In t chins. Miltown Malbay, W. If. Harvey. — 2—6 

 inches* high, flaccid, as thick as horse-hair ; branches long and little 

 divided, springing near the base, beset with short dichotomous ramuli 

 which are often crowded at the apex so as to give the plant a penicil- 

 lated appearance; apices always rounded and obtuse. Articulations 

 extremely variable in length, 4 — 12 times longer than broad. Cohmr fine 

 red, which is rapidly given out in fresh-water, and the plant fades in 

 drying to a dull dingy-brown. Capsules elliptic-oblong or j>\ riform, dark, 

 raised on short hyaline pedicells. Very variable in general appearance; 

 but easily recognised under the microscope b\ its thick, scarcely tapered, 

 very obtuse and sparingly dichotomous ramuli and its pediceUated dark- 

 brown capsules' I have carefully compared authentic specimens oi the 

 /■. lint, plant, with individuals figured by Dillwyn, and am convinced 

 of their .specific identity. 



C. branches //■/•( ijiiliiv, ramuli alternate <>>• secund, tubsinpte, — 

 (snuill plants, rarefy < weeding <m inch in height)* 



• forming broad, woolly tufts, on rocks or tin larger Alg 



81. ('. lintlm. Lyngb. (Roth's CaUtAamnion); filaments 

 forming wide entangled fcufti short erect dichotomoos, branches 

 long straight appressed. — Lyngb, tfydroph. Dan. p. 129. /. il. 



Ag. Sp. M'i. r. •_'. //. [&5.~Cbn/erva Rotht%\ Tart. — Dillw. 

 Conf. t. 78. 12. Bot t. 1702. 



Marine rocks, near high-wattr mark, common. 1 (laments i quarter 



