Fulysijj/ionia.] ALG/E C ONFERVOlDEiE. 331 



Hutckinsia parasitica, Ag. Sp. Alg. v. 2. p. 103. — H. Mcestingii, 

 Lyngb. Hydroph. Dan. £.36. 



On the larger Algae, and on rocks, rare. Coast of Yorkshire, Dorset 

 and Cornwall, Huds. Bantry, Miss Hutching. Firth of Forth, Dr. 

 Richardson. — 1 — 2 inches high, slender, of a fine red, cartilaginous and 

 scarcely adhering to paper. From every variety of Plilota plumosa, 

 (some states of which it much resembles,) this species may be known 

 by the alternate, not opposite pinnules, and more rigid texture. The 

 finest specimens I have gathered grew on the perpendicular faces of 

 rocks, at the extreme ebb of springtides : and Mr. Sconce finds it in a 

 similar locality at Plymouth- 



f f Rigid ; dark red or brown, stria numerous. 



11. P.atro-j'ubescens, Grev. (dark red Polysipkonia); filaments 

 elongated sparingly branched rigid, ramuli short subfasciculate 



or scattered subulate erect, lower articulations twice or thrice, 

 upper ones half as long as broad, capsules ovate pedunculate or 

 sessile. — Conf. atro-rubescens, Dillw. Conf. t. 70. — C, nigra, 

 Dillw. Conf. Syn.p. 86. E. Bot. t. 2340. — Hutckinsia atro-rubes- 

 cens, Ag. Sp. Alg. v. 2. p. 64. 



On marine rocks, " far from uncommon on any of our shores,'.' 

 Dillw. — Confined principally to the southern parts of England. Stems 

 tufted, often covering the rocks in large patches ; 2 — b' inches high, 

 thicker than horse-hair, more or less furnished with short, subulate, 

 erect ramuli ; veins numerous, spiral. Colour deep red, often becom- 

 ing blackish in drying, in which state it scarcely adheres to paper. Cap- 

 sules subglobose, with a very wide truncated aperture, inclosing a tuft of 

 pyriform seeds. 



12. P. Agardhidna, Grev. (AgardJis Polysiphonia); filaments 



elongated much branched rigid, ramuli subfasciculate divaricat- 

 ing attenuated at each cud. lower articulations twice or thrice 

 as Long, upper shorter than their diameter, " capsules < 

 " rotundato-convex quite >e->ile." Grev, Crypt. 11. t. 210. 



Ag. Sp. Alg, V, l'. p. (i(). 



On marine rocks; Firth of Forth, Dr. Grevilie. Appin, CapUCar* 

 michael.—Dr. Grevilie has taken much pains to illustrate this species in 

 bis Crypt, Flora, and yet I am unable satisfactorily to distinguish it 

 from /'. atro-rubetcetU s though with tin- assistance of that author's own 



specimens. The character of the fusiform ramuli, on which Dr. Gre- 

 vilie lays so much Btress, is Burelj variable, even in the same tuft; and, 

 ai I cannot acknowledge the roundish bodies he calls " capsules," to be a 

 true capsular fruit, 1 can place no dependence on an) distinctions drawn 

 from them. 



1:;. P. bddtOj Grev. (deep-brown Polysiphonia); filaments 

 short subdichotomous rigia, branches elongate straight erect with 

 very acute axilla?, ramuli few icattered, articulations uniform 

 rather Longer than broad. Conferva badia, Dillw, < 

 r . ^.,. /. ( ,. Huichintia badia, //< P. IL /■ 



i i r, (Hi nor ///».'. 



