88 BTKOP8I8 OF BRITISH SEAWEEDS. 



best distinguishing murks. The different form of tin* cap- 

 sules afibrdfl alone a sufficient character to separate it from 

 C. parvula, 



1 15. parvula (The small Chylocladia) ; frond subgelatinous, 

 Blender, bushy, irregularly branched; rarmili Bcattered; 

 branches constricted at intervals of (nearly) equal length 

 and breadth; ceramidia conical, with a prominent orifice, 

 Hook. Br. Fl. v. 2. p. 298. (Atlas, PI. XXX I V. Pig. 153.) 

 Gastridium parvulum, Grev. Lomentaria parvula, Zanard. 



Chondria parvula, Ag. Fucus kaliformis, var., Turn. 

 Hab. Parasitical on the smaller Alga?, in tide-pools, near low- 

 water mark. 

 This plant, in many of its characters, resembles the 

 smaller specimens of C. kaliformis, of which it was for- 

 merly considered to be merely a dwarf variety. But it 

 may generally be known from all states of that species by 

 its peculiarly bushy, dense habit, and the alternate dispo- 

 sition of its branches and ramuli ; and when found in fruc- 

 tification, the two are clearly distinguished by the different 

 form of the capsular fruit. The ceramidia of C. kaliformis 

 are hemispherical ; those of C. parvula are of much larger 

 size, less abundant, and distinctly conical, with a much less 

 evident hyaline border. The articulations of the branches 

 are shorter and more equal than in C. kaliformis, and 

 those of the main stems never so much distended, nor of 

 so great a proportionate length. 



146. articulata (The jointed Chylocladia); frond tubular, ge- 

 latinoso-membranaceous, strongly constricted throughout, 

 as if jointed, much branched, between pinnate and dicho- 

 tomous, fastigiate, the upper branches often crowded ; cap- 

 sules obtusely conical, Grev. in Hook. Br. Fl. v. 2. p. 298. 

 (Atlas, PI. XXXIII. Fig. 147.) 

 Lomentaria articulata, Lnjngb. Chondria articulata, Ag. Gigar- 

 tina articulata, Lamour. Fucus sericeus, var., FJsper. F. 

 articulatus, Lightf. Ulva articulata, Huds. 

 Hab. Between tide-marks, attached to rocks and Alga?. Annual. 

 Summer. Common. 

 Stunted individuals of Chylocladia articulata closely re- 

 semble Catenella Opuntia, and may sometimes be mistaken 

 for that plant, although the colour is never so lurid as it 

 always is in the Catenella. An appeal to the microscope 

 may sometimes be necessary to the young student, and 

 then there can be no difficulty, the whole structure is so 

 different. 



