THE LASTREAS 155 
PRODUCTA ForsTER.—Fine slender variety. 
SurrHIESH.— А handsome robust, crispy, congested form, 
resembles pseudo-mas in its tough make and scaly character. 
LASTREA PSEUDO-MAS 
ABBREVIATA CRISTATA (Plate XIX).—Prettily crested ; found in 
Borrowdale, Cumberland, by Mr. R. D. Harrison ; a comparatively 
small grower, a foot to eighteen inches. 
APOSPORA PERCRISTATA.—Raised by Mr. Cropper, presumably 
from Г. ps. cristata; a lovely small - growing Fern, with fine fim- 
briate and crested subdivisions; any portion layered and kept 
close produces prothalli in abundance and young plants shortly 
after; a unique variety, but unfortunately very delicate in con- 
stitution ; one of the most interesting varieties of all, since ‘besides 
its beauty it is both aposporous and apogamous ; see Life History. 
CONGESTA CRISTATA.—A dwarf gem raised by Dr. Lyell. 
pem 
Fig. 172. Z. pseudo-mas crispa. 
CRISPA (Fig. 172).—Found in Wales ; dwarf and crispy. 

