THE SOFT PRICKLY SHIELD FERN. 149 
17. intermedium (Woll.). This is a thick robust, fleshy-looking, 
rigid, upright plant, in these respects resembling P. aculeatum. The 
fronds are ovate-lanceolate, large, distinctly bipinnate. The pin- 
nules are crowded and often overlapping ; subtrapeziform from the 
development of the anterior basal angle ; deeply inciso-serrate along 
the margin, the basal anterior lobe being much enlarged, and all 
the segments biserrate, with the teeth aristate. The fronds are 
occasionally multifid, and not unfrequently abrupt at the apex, and 
when so have a tendency to produce bulbils. It has been found in 
—Kent: near St. Mary’s Cray, R. Sim. Sussex: Newick Park, 
J. H. Slater; Littlehampton, G. B. Wollaston. | Somersetshire : 
Nettlecombe, C. Elworthy. Anglesea, T. Pritchard. Glamorgan- 
shire: Swansea. Pembrokeshire: Castle Malgwyn, near Llechryd, 
W. Hutchison. Guernsey, C. Jackson. [Plate XIX B. ] 
18. trapezoideum (M.). This is a dwarf form, somewhat in the way 
of intermedium, i. e., with short broad biserrate pinnules, with the 
anterior angle much developed, diminishing, and becoming some- 
what confluent in the upper part of the frond. The fronds are nar- 
row ovate attenuate, bipinnate ; pinnules broad, almost trapeziform, 
biserrate, confluent near the tips of the pinne ; those of the upper 
pinne somewhat smaller, and much more confluent. Devonshire : 
Ilfracombe, Rev. J. M. Chanter. Somersetshire: Nettlecombe, C. 
Elworthy. Lancashire, R. Morris. Sussex: Littlehampton, G. B. 
Wollaston. Kent: Sturry. Kerry: Killarney, R. Barrington. 
19. pulchrum (M.). The fronds of this form are lanceolate; the 
pinnules ovate, strongly auricled, inciso-lobate, with unequally 
serrated lobes; the fertile pinnules in the upper part of the frond 
are rather more deeply lobed, smaller, somewhat decurrent;. here 
and there a few pinnules are depauperated. Somersetshire: Nettle- 
combe, C. Elworthy. 
20. irregulare (M.). This is a very curious form, large and ovate- 
acuminate in outline, bipinnate. The lower pinne, which are the 
most perfect and normal in character, are longest and bear varying 
and unequally inciso-lobate pinnules, the basal anterior lobe of which 
forming the auricle, is much enlarged, and considerably detached, 
while the rest form lacerate serratures or lobes, all the larger of 
which are again serrated. The upper pinne are fertile, more or 

