338 ALGiE CONFERVOIDE^. [Calithamnion. 



2. G. midtifida, Ag. (multifid Griffithsid) ; filaments slender, 

 whorls distant, ramuli dichotomous incurved. — Ag. Sp. Alg. 

 v. 2. p. 133. — Conferva multi/ida, E. Bot. t. 1816. Dillw. Conf. 

 Syn. p. 75. — [3. pilifera ; Ag. branches distichous sub-opposite, 

 ramuli elongated. 



On many coasts of the south of England, Mrs. Griffiths, Mr. Borrer, 

 &c. Bantry, Miss Hutchins. Miltown Malbay, W. H. Harvey. — /3. at 

 Torquay, Mrs. Griffiths. — 2 — 6 inches high, slender, much branched, 

 rose-red. Articulations of the stem very long. Capsules minute, ellip- 

 tical, with a broad pellucid limbus, sessile on the lower part of the 

 ramuli, secund or opposite, occasionally tufted. Favellcs roundish, 

 pedunculated and involucrated, containing minute granules. The cap- 

 sules are rather rare, but Mrs. Griffiths has sent us fine specimens in 

 this state. 



** filaments dichotomous, naked. 



3. G. barbdta, Ag. (pencilled Griffithsid); filaments dichoto- 

 mous setaceous, articulations 5 — 6 times as long as broad, the 

 uppermost emitting long opposite multifid fibres. — Ag. Sp. 



Alg. v. 2. p. 132 Conferva barbata, E. Bot. t. 1814. Dillw. 



Conf. Syn. p. 75. 



Very rare. Beach at Brighton, Mr. Borrer. 



4. G. cor dllina, Ag. (Coral-like 'Griffithsid) ; filaments thick- 

 ish gelatinous dichotomous, axils patent, articulations swollen 

 upwards, 2 — 4 times longer than their diameter. Ag. Sp. 

 Alg. v. 2. p. 127. — Conferva corallina, Dillw. Conf. t. 98. E. 

 Bot. t. 1815. 



South of England, not uncommon: more rare in the north, and in 

 Scotland. Hartly, Northumberland, Mr. Winch. Appin, Capt. Car- 

 michael. 



5. G. setdcea, Ag. (setaceous Griffithsid); filaments dichoto- 

 mous setaceous rigid straight, axils very acute, articulations 

 cylindrical 5 — 6 times longer than broad. Ag. Sp. Alg. v. 2. 

 p. 129.— Conferva setacea, Dillw. Conf. t. 82. E. Bot. t. 1689. 



Sea-shore, not uncommon. — Mrs. Griffiths remarks, that on immersion 

 in fresh water " it twists, the skin bursts with a slight explosion and 

 emits the colouring matter which sinks in fine powder." Mr. Sconce 

 has noticed a similar " irritability." Involucres raised on lateral clavate 

 peduncles, 2 — 3 lines in length, their ramuli simple or forked, bearing, 

 on the interior faces, minute, sphaerical, crowded, trisporous capsules, 

 furnished with very broad pellucid pericarps. Favellce I have never 

 seen, but Mrs. Griffiths communicates from Torbay, specimens produc- 

 ing a very extraordinary modification of fruit, resulting probably from 

 disease; and Mr. Borrer informs me that a similar appearance was ob- 

 served by Miss Biddulph many years ago, and communicated by her to 

 Mr. Sowerby. This consists in minute ovate bodies, apparently compos- 

 ed of whorls of extremely slender filaments, invested with jelly and 

 attached, like the capsules, to the interior faces of the involucral bractecs. 



64. Calithamnion. Lyngb. Calithamnion. 

 Filaments articulate, mostly pinnated, one-tubed; dissepiments 



