8b SYNOPSIS OF BRITISH SEAWEEDS. 



forms as, to i 1 h ' excellent Lightfoot, who proposed I 



scribe it under the specific naiiie bestowed upon it \<\ 



Turner. It also appear- fco have been in some respects 



knows to Hudson, in whose herbarium specimens are pre- 

 served. But previously to the publication of M p. Turner's 



memoir, it was very commonly regarded as a state of ( 7 //- 

 Vocladia kaliformisy a plant of a different structure and 

 different ramification. 



141. rosea {The rosy Chrysymenia) ; fronds distichous, pinnate, 

 or bipinnate, the main stem and the pinnae and pinnules 

 elliptic-oblong, compressed ; pinnae opposite, Harv. Pity. 

 Brit. ill. 301. (Atlas, PI. XXXI. Fig. 1 11, 142.) 



Chrysymenia Orcadcnsis, Harv. 



Hab. Orkney and Yorkshire. On rocks and Alga? in deep 

 water. Annual ? 

 Distinguished from the preceding species by its more 

 elliptical and obtuse ramuli, which are greatly more con- 

 stricted at the insertion. Another character consists in 

 the tetraspores being collected into several distinct sori, not 

 dispersed through the branchlets, or forming one general 

 sorus. 



XLV. CHYLOCLADIA. 



142. ovalis (The oval-leaved Chy loci adia) ; frond cyhndrical, 60- 

 lid, irregularly dichotomous, naked below, above beset with 

 simple, elliptical, rarely elongated and jointed, tubidar ramuli ; 

 capsules spherical, with a wide transparent border, Hook. Br. 

 Ft. v. 2. p. 297. (Atlas, PI. XXXII. Fig. 145.) 



G-astridiuin ovale, Grev. Gastroclonium ovale, Ktz. Lomen- 



taria ovalis, ~Endl. Chondria ovalis, Ay. Gigartina ver- 



micularis, Lamour. Fucus ovalis, Muds. F. vermicular is, 



Gm. F. sedoides, Good, and Woodw. 



Hab. Atlantic coasts of Britain. On rocks and stones within 



tide-marks. Annual. Spring and summer. 



There is some difference in habit between this plant and 



the other members of the genus Chylocladia, but so close 



an affinity in the more important points of its structure, 



that it appears very undesirable to separate it from them, 



as has been proposed by Prof. Kutzing. Except in having 



a solid, cellular stem and branches, the hollow and jointed 



portions being confined to the ramuli, there is nothing to 



separate it from C. kaliformis, the type of the genus. It 



is in greatest perfection in the months of April and May, 



at which season, on the west coast of Ireland, it forms a 



