jointed filaments, formed of Jong, cylindrical cells; the medial, of long, 
irregularly disposed, elliptical cells ; the ou¢er, of minute, vertically placed, 
dark-red cellules, forming simple filaments whose tips constitute the minute 
surface cells seen when the frond is viewed under the microscope. 
eee 
Kalymenia reniformis, first described in the ‘ Historia Fucorum,’ 
was discovered by Miss Everett, early in the present century, on 
the shores of the Isle of Wight, and long regarded as an extremely 
rare species. Of late years many new habitats have been ascer- 
tained for it, and it is now, at least in Ireland, known to be far 
from uncommon. In Scotland it appears to be more rare, and 
yet it occurs as far north as Orkney. At Falmouth, Miss Warren 
finds specimens without fruit, which differ from the usual state 
of the species in being of a more oblong form, and much more 
tapering at the base. These may possibly belong to a new, but 
nearly allied species, and I therefore abstaim from noting them 
further at present. 
I have ventured to quote Sarcophyllis lobata, Kiitz., founded 
by that author on a specimen gathered at Sidmouth, and existing 
in the herbarium of Senator Binder of Hamburgh, under the 
present species, but how far I am correct in so doing cannot be 
determined without consulting the origimal specimen. 
Fucus acetabulum, Gouan, quoted by Agardh as a synonyme 
of his Halymenia reniformis, and which, so far as I know, is the 
only authority for his Mediterranean habitat, is, as I have 
ascertained by an original specimen in Herb. Hooker, a totally 
different plant ; namely, Constantinea reniformis, Post. and Rupp. 
(Crytonemia? Forbesii, Harv. m Hook. Ic. t. 679; Neurocaulon 
foliosum, Zanard.). Endlicher, misled by Agardh, confounds 
these species, and consequently, but most incorrectly, reduces 
the well-distinguished genus Consrantinga (founded on Fucus 
rosa-marina, Gm.) under Kalymenia. 
The Cape of Good Hope specimens, mentioned in the Manual, 
are regarded by Professor J. Agardh as belonging to a distinct 
species, named by him A. Harveyana. 
Fig. 1 and 4. KaLYMENIA RENIFORMIS, with tetrasporic fruit. 2 and 3, with 
favellidia :—natural size. 5, Portion of the frond, with a cluster of favel- 
lidia. 6. Section showing the structure of the frond, and of a favellidium. 
7. Spores. 8. Portion of the frond with tetraspores. 9. Tetraspores :— 
all more or less magnified. 
