328 ALG^ CONFERVOIDEiE. [Folysiphonia. 



ones simple, the larger, again, pinnatifid; pinnulse broadly subulate, 

 subacute. — The only fruit hitherto found on this variety consists in ter- 

 nate granules, imbedded in the uppermost pinnulae. 



2. P. Carmichadidna, Harv. MSS. (CarmichaeV s Polysipho- 

 nia); filaments tufted rigid branched from the base, branches 

 alternate inarticulate divaricating, ramuli subdichotomous very 

 patent, their articulations as long as broad. — P. divaricata, 

 Carm. MSS. (not of Ag.) 



On Dcsmarcstia acideata, at Appin, Captain Carmichael. — Filaments 

 tufted, 4 inches high, rigid, thicker than hog's bristles, branches scattered, 

 issuing at right angles, ramuli sparingly divided, patent and divaricating. 

 Stem and principal branches longitudinally striated, inarticulate, or 

 towards the apex having an obscure appearance of joints; articulations of 

 the ramuli 2 — 4-striate, somewhat swollen at the joints. Colour " red- 

 dish-brown," changing to black in drying. Fruit unknown. In drying 

 it adheres very imperfectly to paper. — A most distinct, and I think un- 

 described, species, of which I have only seen the single specimen found 

 by Captain Carmichael. 



3. p. Brodicsi, Grev. (Brodie's Polysiphonia) ; filaments 

 continuous cartilaginous, branches alternately pinnated with 

 spreading fasciculato-multifid flaccid ramuli, articulations of the 

 ramuli rather longer than broad. — Conferva Brodiaii, Dilliv. — 

 E. Bot. t. 2589. — Hutchinsia Brodicsi, Ag. Sp. Alg. v. 2. p. 63 — 

 /3. sub-simplex. Hutch. penicellata, Ag. Sp.Alg. p.65 — H.Bro- 

 dicei, Lyngb. Hydroph. Dan. t. 33. 



On marine rocks and the larger Algce. Discovered by James Brodie 

 of Brodie, Esq., near Forres. Abundant on various coasts of Scotland 

 and the west and south of England. Very common on the west of 

 Ireland. — One of the most beautiful of the genus, and easily recognised 

 by its broadly fasciculate ramuli, and inarticulate stems. The substance 

 is extremely flaccid and decomposes almost immediately in fresh water. 

 Fruit of 2 kinds: 1. Capsules ovate, becoming contracted in the up- 

 per part into a short obtuse neck, reticulated, subsessile, including 

 sphaerical seeds. — 2. granides imbedded in distorted ramuli.— /3, which 

 we have from Captain Carmichael, who gathered his specimens at Staffa, 

 differs from the usual state of the plant in being less branched, more 

 rigid, of a darker colour and with more dense ramuli. 



4. P. Lynghyei, Harv. (Lyngbyes Polysiphonia); main fila- 

 ments thick cartilaginous inarticulate, ramuli elongate irregularly 

 dichotomous very slender, crowded round the apices of the 

 branches in broad fascicles, axillae acute, articulations 2 — 4 times 

 longer than broad. — Hutchinsia Lyngbyei, Ag. Sp. v. 2. p. 85. — 

 H. strictoides, Lyngb. Hydroph. Dan. p. 114. t. 35, (bad.) 



Shores of Bute, on the larger Algae, Dr. Greville. — 6—10 inches high : 

 main filaments as thick as those of P. elongata, cartilaginous, inarticulate, 

 marked with short flexuose veins, not unlike the lireUce of an Opegrapha, 

 but wholly destitute of the appearance of dissepiments. Branches irre- 

 gular, patent, sparingly divided, their lower part almost bare, the upper 

 densely clothed with long, very slender, broadly fasciculate, crim- 

 son ramuli ; ramuli much branched, straight, irregularly dichotomous, 

 not in the least attenuated at the base ; the axillae very acute ; articu- 



