78 BRITISH FERNS 
¡to grow in the locality ; hybridization with Scolopendrium vulgare 
is more credible. Similar forms are recorded in four places. 
CORYMBIFERUM represents a similar type to cristatum, shown 
below, but on round, bunch-crested lines. 
Fig. 39. Asp. trich. cristatum. 
CRISTATUM, Wollaston (Fig. 39 and Appendix No. II).—A type 
which the writer has found on two occasions, and which, as figured, 
cropped up from a stray spore under cultivation. 
HARROVIL, Moore (Fig. 40), is a dwarf, slender form with small, 
serrate pinna, very pretty. 
Ixcisum, Moore (Fig. ді and Appendix No. III).— This, which 
represents the plumose form of the species, and is precisely akin in 
character to the Welsh Polypody (P. v. cambricum) in presenting 
expanded and deeply cut fronds, accompanied by entire sterility, 
has been found in several places; in one instance a fertile form is 
recorded, but as nothing appears to have resulted, we think this 
requires confirmation. 

