Calithamnion.] ALGiE CONFERVOIDE/E. 339 



hyaline. Fruit double: — 1. astomous capsules with hyaline 

 pericarps, scattered on the ultimate ramuli : 2. roundish or 

 lobed gelatinous receptacles, containing- large granules, seated on 

 the main branches. — Name; xa/.o;, beautiful, and &x/x<jog, a shrub. 

 — A most beautiful and natural, but very difficult genus, forming 

 endless species and varieties. In the parts of fructification it 

 scarcely differs from Griffithsia. 



A. ramuli opposite. 

 a. erect, much branched, root scutate. 



1. C. Plumula, Lyngb. (pectinated Calithamnion) ; ramuli 

 short opposite recurved pectinated in their upper margins. — 

 Lyngb. Hydroph. Dan. p. 127, (excL var. (3.) Ag. Sp. Alg. v. 2. 

 p. 159. — Conferva Plumula, Dillw. Conf. t. 50. — C. Turneri, 

 E. Bot. t. 1637, (nott. 2339.) 



8ea-shores, from Orkney to Devon ; frequent in many places. — A 

 beautiful species, easily known by its very peculiar and symmetrical 

 ramuli. Mrs. Griffiths finds a variety, smaller in every part. The 

 favellce are large, lobed and clustered. 



2. C. crucidtum, Ag. (eructated Calithamnion); ramuli 

 elongated opposite or quaternate slender pinnated, pinnae long 

 very erect, main articulations 4 — 5 times longer than broad. — 

 Ag. Sp. Alg. v. 2. p. 160. 



Pier, Torquay; Mrs. Griffiths. — 1 — 3 inches high, densely tufted, 

 sparingly branched; branches long, erect and subsimple, their apices (to 

 the naked eve) dark and obtuse, beset for their whole length with opposite 

 or quaternate pinnated ramuli, a line in length. Colour a dull brownish- 

 red. Capsules elliptical, dark-red, trisporous, borne on the tips of ab- 

 breviated pinnules. Favellce unknown. 



3. C.pumilum, Harv. MSS. (slender cruciated Calithamnion) ; 

 ramuli very Bhort opposite pinnated, pinnae abbreviated close 

 very erect, main articulations 2 — 3 times longer than broad. 



At Miltoun Malhay, /('. II. Harvey. — Resembling the last in minia- 

 ture. Filament* rarelj an inch high, sparingly and distantly branched, 

 each articulation furnished with a pair of very short, pinnated ramuli, 



which arc crow (.led toward the apices of the branches : fruit unknown. 



1). jilann nts creeping, thro w ing up erect branches or stems. 



4. ('. Turneri\ Ag. (7\tmer's Catithamstiori) ; filaments 

 creeping, stems erect simple or slightly branched oppositely 



pinnated, art iciilal ion> of the Stem 5 — l<> lime- longer than 



broad. — -1'/. Sp. Alg. v. 2. p. 160. — Conferva Turneri, Dillw. 



Conf.L LOO. /:. BoL t. 2339, (not t. L637.)— Ceramium 7Wr- 



Grev. Crypt. FL t. 355. — Ualithamnion variabiU, Ag. Sp. 



Al i. v. -. />. 163 (according to specimens from the autkor\ 



< >n the larger Atee; not uncommon on many shores of England 



ami Ireland, laic in Scotland. Near Berwick, /' irdh*S 



CaUihamnkm variaMle, which I ba?e gathered abundantly in Dublin bay, 



differs from the usual BtaU of the plant in being more branched, and 



