1 12 BRITISH FERNS.— SUB-ORDER IT. TRIBE 10 . 
2. angustifrons, Moore. Found at Barnstaple by the late Mr 
Jackson. 8 X i inches. Exceedingly narrow. 
3. extremum, Lowe. Found in Devon, in 1864, by the late Mr. 
C. Elworthy. 14x3 inches. Allied to obtusissimum. Pinnae 
touching, but not overlapping. 
4. Hartleyi, Lowe (alatum Hartleyi, Barnes). Found in 1870, on 
Furness Fell, by Mr. T. Hartley. Distinct; pinnules confluent and 
imbricated. 
5. imbricatum, Moore. A narrow, imbricated, very lax form, found 
in Somerset by the late Mr. Elworthy. Length, 24 inches. Pro- 
liferous. 
6. pterophorum, Moore. Found in Devon by Mr. G. B. Wollas- 
ton. 24 X 3^ inches. An ally of alatum. 
7. pumilum, Moore. Found near Nettlecombe by Mr. El worth}'. 
9x2 inches. Almost recurved. 
Group III. Flexuose. 
(Abnormal curving of skeleton.) 
Section a. FLEXUOSUM. 
1. abasipinnulum, Moore (medio-deficiens, Padley). Found in 
Dorset, in 1876, by Mr. R. Thompson (3, The Residences, South 
Kensington Museum). A flexuose variety, not unlike gracile in 
general appearance. The three or four basal pinnules, "to within 
two inches of the tip of the frond, reduced to the stem of the pin- 
nule. 22x5 inches. 
2. flexuosum, Wollaston. Mr. Wollaston, between 1870 and 
1873, found several plants in North Somerset and South Devon 
that varied in the flexuose character. The stipes and rachis bend- 
ing in an extraordinary manner. 20 x 5 inches. A dwarf form in 
the Clifton Zoological Gardens was possibly raised from flexuosum. 
3. grandidens, Lowe (grandidens flexuosum, Moly). Found in 
1870, in Devon, by Mr. J. Moly. A narrow, depauperate form, 
in which the upper part curls round. 14 X 1 inches. 
4. pendens, Lowe (flexuoso-pendens. Wills). Lax and beautiful. 
5. reflexum, Wollaston. Found in Devon by Mr. G. B. Wollas- 
ton, pinnules reflexed. 
6. revolutum, Lowe. Found by myself, in 1SS7, in a hedge at 
Shirenewton. 22x3 inches. Rather larger and bolder than revol- 
vens. 
7. revolvens, Moore. Found in 1S72, in Somerset, by Mr. T. 
Wills. 18x2 inches. The pinnae revolve, curving over the back 
of the frond, and by this means shortening their width one half. 
8. subrotundatum, Bel/airs. Found in Devon about 1865 by 
Miss Bellairs. 16X2J inches. A subflexuous form, and subrotun- 
date. Pinnae flexuose and ascending. 
