Catenella.} ALG^E RHODOSPERMEjE. 187 



1. G. capillaris, Carm. Banded Gloiosipkonia. Berk. Alg. 

 t.l7.f.3. Fucus cap. Turn. t. 31. E. Bot. t. 2191. Meso- 

 gloia % capillaris, Ag. Harv. in Hook. Br. Fl. v. ii. p. 386. 



Very rare. Bantry bay ; Miss Hutchins. Fronds 3 — 6 inches 

 long, much branched, fine rose-red, often a line in diameter. Branches 

 mostly opposite, attenuated at the base, liamidi very numerous, 

 short, slender, flexuose, subulate. Globules of fructification large. 



29. Chjetospora. Ag. Chaetospora. 



Frond cylindrical, filiform, solid, subgelatinous, rose-red ; the 

 centre (axis) laxly cellular ; the periphery membranaceous. 

 Famuli setaceous, fusiform, composed of articulated, branched, 

 radiating filaments, and containing a mass of minute red 

 seeds. — Name ; x ai7 V> a bristle, and airopa, a seed or sporule ; 

 the filaments of the ramuli being supposed by some to be 

 connected with the fructification. Though the structure of 

 this curious plant (except as regards the ramuli) is perhaps 

 more that of the following tribe ( Gasirocarpea? ) than of the 

 Gloiocladea ; yet in habit it so completely agrees with Me- 

 sogloia and Gloiosiphonia, that I do not wish to place them 

 in different families. The periphery, too, consists of exceed- 

 ingly minute longitudinal fibres, firmly agglutinated into a 

 membrane. May not Chaetospora, therefore, be regarded as 

 a Mesogloia, wanting the verticillate filaments ? 



1. C. Wigghii, Ag. Mr. Wiggs Chaetospora. Hook. Br. 

 Fl. v. ii.p. 306. Fucus Wigghii. Turn. Hist. t. 102. E. Bot. 

 t. 1165. 



Very rare. Bantry bay ; Miss Hutchins. Kilkee, County of 

 Clare, extremely rare ; W. H. Harvey. Frond 6 — 12 inches long, 

 much branched, fine rose-red. Hamuli 1 — 2 lines long, fusiform, con- 

 taining a dark mass of granules. 



Tribe IX. GASTROCARPE.E. 



Plants marine, of a pink, purple, or dull red colour, of a car- 

 nose, gelatinoso-cartilaginous or membranaceous substance ; u ihe 

 structure consisting of a cellular external coat or membrane, and 

 a pellucid, gelatinous, internal mass, mostly traversed by colour- 

 less jointed filaments arising from the outtvard membrane." 

 Frond cylindrical, compressed, or flat, destitute of midrib or veins. 

 Fructification ; globules or clusters of minute red seeds imbedded 

 in the internal substance of the frond. 



30. Catenella. Grev. Catenella. 

 Frond filiform, somewhat compressed, creeping, throwing up 



