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. 



Harrovii, Moore (Fig. 40), is a dwarf, slender form with small, 

 serrate pinnae, very pretty. 



Incisum, Moore (Fig. 41 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. 



