THE POLYPODIES. 
121 
merit. The fronds are of three classes, viz., a few absolutely 
normal; others with the pinnae sub-divided into long, blunt- 
pointed segments; and, finally, exquisitely divided fronds of 
the most delicate character. In trichomanoides the inter- 
mediate fronds do not appear. A curious feature of all three 
is the occasional appearance of mixed fronds, in which quite 
common plain pinnae are mixed up anyhow with others of 
the most divided type. The first-named is the parent of the 
other two. 
Fig. 27 .— Polypodium vulgare trichomanoides. 
P. V. cristatum (crested) (5). Old wild find. Frond and 
pinnae tips uniformly and neatly flatly crested. 
P. V. cristatam, Scarborough (Woll) (4). A very superior 
form, with cresting much more developed. 
P. V. cristatam, Forster. One of the grandest crested 
forms found in Lake district. Crests at all tips. Yery large. 
P. V. Claphamii (?) (Clapham’s) (12). Provisionally named. 
This is one of the most striking, and at the same time most 
beautiful, examples of hybridisation, it being an unmistakable 
cross between P. v. hifido-cristatum (2) and cornuhiense (10). 
