See. MELANOSPERME.E. ( 75 ) Fam. DICTYOTEtE. 



ZONARIA COLLABIS.— ^^. 



Gbn. Char. — "Root coated with woolly fibres; frond flat, ribless, fan-shaped, entire 

 or variously cleft, marked with concentric lines ; the cells of the surface radiating ; 

 margin fringed. Fructification : roundish or irregular, scattered sori, bursting 

 through the cuticle of both surfaces of the frond, consisting, at maturity, of 

 numerous spoi-es nestling among jointed threads." — Fhyc. Brit. Name from 

 ^bivt), "a zone." 



ZoNARiA collaris. — " Frond procumbent, coriaceous, orbicular or 

 cuneate, and variously lobed, from its upper surface emitting cup-shaped, 

 membranaceous fronds ; the under sui-face rooting and densely stupose." 

 — Phyc. Brit. 



ZoNARiA collaris.— Ag. Sp. Alg. vol. i. p. 127; Ag. Sijst. p. 264; /. Ag. Alg. 

 Medit. p. 38 ; Endl. 3rd Suppl. p. 25 ; Kutz. Sp. Alg. p. 5G5 ; 

 Harv. P. B. plate 359 ; Haw. Syn. p. 32 ; Atlas, plate 13, fig. 49 ; 

 /. 0. Agardh, Sp. Gen. Alg. vol. i. p. 107. 



Padina collaris. — Grev. Syn. part 44; Menegh. Ital. p. 245; Mont. Alger, p. 33. 



Padina omphalodes. — Mont. Crypt. Alger, p. 15, No. 168. 



Zanardinia prototypus. — Nardo (Me Meneg. &c.). 



Hab. — Washed ashore at Granville and St. Catherine's Bays, Jersey (May 1851, Miss 

 Twrnei-; Mr. F. P. Girdlestone, 1859). 



Geogr. Dist. — Mediterranean and Adriatic Seas ; West Indian Sea. 



Description. — " The primary frond, when mature, is coriaceous in 

 colour and substance, widely spreading, furnished with a dense woolly 

 coating on its lower surface, by which it strongly adheres to rocks ; the 

 upper surface is smooth, and variously plaited longitudinally, but by 

 the action of the waves and of animalcules is very much torn and lobed. 

 From the upper surface of this primary frond rise cup-shaped secondary 

 fronds, fixed by a very short stipes, in the dried plant resembling an 

 umbilicus, and with the limb fringed with filaments. The youngest of 

 these secondary fronds are smaller than peas ; the full-grown about the 

 height of the cup-shaped fronds of Himanthalia ; all are delicately mem- 

 branaceous, entire, and easily torn. The fringe of hairs that crowns 

 the frond is formed of the free apices of the longitudinal strings of 

 cells of the frond. Fruit unknown." — J. Ag., Phyc. Brit. 



Not being well acquainted with this plant, we give the charactei-s and 

 descriptions from Phyc. Brit. 



