














— ————————————P—— 
178 THE BRITISH FERNS. 
the margin, with the surface near the edge a good deal furrowed, 
sent from Nettlecombe by Mr. Elworthy ; the other crenately-lobed, 
not toothed, and having distant slightly seulptured ridges, sent from 
Exeter by Mr. R. J. Gray. They are both plants of ornamental 
character. 
89. jugosum (M.). The peculiarity in this variety consists in a 
thickening of the veins which bear sori, resulting in the production 
of a series of herbaceous ridges or sorus-like. excrescences on the 
upper surface, opposite to the sori of the lower surface; this 
feature produces a curious ridgy appearance on the surface. Two 
or three modifications of this structure have been met with. The 
most marked was found in Guernsey by Mr. James; others have 
been met with by Mr. Jackson in Guernsey, and at Barnstaple in | 
Devonshire; Mr. Wollaston has also found the same form at Ottery 
St. Mary in the latter county. It is rather a capricious form, and 
sometimes runs out of character in the first or summer growth. 
90. papillosum (M.). This curious variety developes a series of 
distinct wart-like excrescences side by side, on the upper surface of 
the veins, near their apices, forming a kind of border to the fronds ; 
the latter, in the specimens we have seen, being small and rather 
narrow, but of normal outline. It was.sent from Guernsey by Mr. 
C. Jackson, and, like jugosum, is not of fixed character, producing, 
. however, characteristic fronds in the later or autumnal growth. 
The following varieties are also more or less muricate :—submar- 
ginatum (74), bimarginato-muricatum (88). 
Crispum Series. 
91. crispum (Willd.). This beautiful variety, one of the oldest 
forms known, and admired for the elegant frilling of its fronds, is, we 
believe, always barren. The fronds attain the full size of a foot or 
more in length, and two to two and a half inches in breadth, the 
margin being parallel or nearly so, and exquisitely and symme- 
trically waved or undulated or frilled, the extreme edge being 
usually more or less crenate; the base is cordate, the basal lobes 
being often. unusually developed so as to overlie each other, and 
sometimes quite separated down to the costa. Dwarf, truncate, 

