Polysiphonia.] AI.G.E CONFERVOIDE/E. 333 



ing each other; joints variable, those of the main stem 3 — 5 times, of 

 the ramuli about twice, as long as broad. Colour when recent of a " bright 

 brick red" (Mrs. Griffiths), changing in the herbarium to a deep umber 

 brown : substance, according to the same lady, " at first firm, but be- 

 coming flaccid immediately." Capsules unknown. A most distinct and 

 beautiful species. 



18. P. fastigiata, Grev. (fastigiafe Polysiphonia) ; filaments 

 rigid setaceous equ.il, many times dichotoinous, axils patent, 

 articulations shorter than their diameter. — Conferva polymorpha. 

 DiUw. Conf. t. 44. E. Bot. t. 1764 — Hutch, fastigiata, Ag. Sp. 

 Alg. v. 2. p. 67. 



Parasitic on Fucus nodosus, vesicalosus and serratus: very common. — 

 Copt. Carmichael finds this species frequently bearing tufts of very minute, 

 lanceolate, yellow, pod-shaped bodies (antheridia) on the apices of the 

 branches, in such abundance as quite to affect the colour of the plant. 

 Similar bodies are occasionally seen on others of the Genus. 



19. P. Fichardsoni, Hook. MSS. (Dr. Richardson's Polysi- 

 phonia) ; filaments cartilaginous, branches elongate divari- 

 cating beset in the upper part with very patent straight sub- 

 diehotomous ramuli, articulations of the stem and branches 2 — 3 

 times longer than broad irregularly veined, of the ramuli shorter, 

 capsules sessile globose. 



At Colvend, Dumfries, Dr. Richardson. — 3—4 inches high, rigid, 

 nearly as thick as hog's bristles at the base, branched throughout ; 

 branches alternate, often issuing at right angles. Colour a dull-red, 

 becoming darker in drying. Main articulations marked with nume- 

 rous anastomosing irregular tubes, those of the lower branches 3 — 5- 

 tubedj of the ramuli 2 — 3-tubed. Capsules sessile, scattered, subglobose, 

 with a very wide truncated aperture. 



\\\ Jihiim ids rigid, cartilaginous ; raundi jlacci'L membranaceous* 



20. P. elongate, Grev. (Lobster-horn Polysiphonia) ; filaments 

 robust cartilaginous Bubdichotomous Bbrubby, ramuli Blender 

 attenuated ai base fasciculate Bubterminal, articulations shorter 

 than broad reticulated with veins. — Conferva elongata* Dillw. 

 Conf. t. ■ >■>. E. Bot. t. 2429s— Hutchinsia elong.* Ag. Sp. Alg* 

 r. 2. j>. 82. — Ceramiunx elong., Lyngb. Hydroph* Dan. />. 1 17. 

 Grcr. Crypt. Edin. p. 810, — 3* denudata ; filaments nearly 

 opaque distorted beset with wart-like excrescences and desti- 

 tute of ramuli. Cer* brachygonium, Lyngb. Hydroph. Dun. t. 

 36. — /. sanguinolenta; ramuli mostly confined to the apices "t 

 the branches spreading in broad dense fasciculi, ofa fine crimson 

 colour. Ag. Sp. Alg. p. 85, — /'. rosso, Grev. Crypt. Edin* 

 p. 810, (according (<> authentic tpec ime ns, ) 



bore, <»n shells, stones, and corallines, &c, common* — \* and y. 

 found occasionallj ■ their capsules very rsre, but gathered abundantly at 

 Appin bjCapt. CarmichacL—A perfect Proteus, but easih recognized in 

 all its vari.tii s by its robusf sinus, ( as thick ;is w hipcord ). anastomosing 

 reins snd basally ■ttenuated ramuli. 



