242 THE BOOK OF CHOICE FERNS 



P. Y. falcatum — fal-ca'-tum (sickle-shaped), Kellogg. 



In this variety, which, according to Eaton, is found growing sometimes 

 on trees and sometimes in crevices of rocks in Shoalwater Bay, Washington 

 Territory, and near Port Orford, Oregon, the leaflets, very gradually narrowed 

 to an acute point, are finely toothed. Eaton states (" Ferns of North 

 America," vol. i., p. 202) that " the fronds are ample, about Ift. long, 

 and broader in the middle than at the base," and that " they are much 

 thinner in texture than those of P. vulgare, to which Baker has referred 

 the plant." — Eaton, Ferns of North America, i., t. 26. Hooker, Synopsis 

 Filicum, p. 334. 



P. Y. grandiceps — gran'-dic-eps (large-headed). A synonym of P. v. 



multijido ■ oris tatum. 



P. Y. hibernicum — hib-er'-nic-um (Irish). Synonymous with P. v. 

 semilacerum. 



P. Y. interruptum — in-ter-rup'-tum (interrupted), Moore. 



This variety, more curious than beautiful, was originally discovered at 

 Tunbridge Wells. Its fronds are of normal shape and ordinary dimensions, 

 but some of the leaflets in their lower half are found either totally wanting 

 or maimed in such a way as to be occasionally forked or curiously cleft. — 

 Lowe, Our Native Ferns, i., fig. 19. Moore, Nature-printed British Ferns. 



P. Y. lobatum — lob-a'-tum (lobed), Sidehotham. 



The fronds of this handsome variety have their lower leaflets large and 

 distinctly eared on their upper edge next the rachis and notched, and the 

 spore masses are of a particularly small size. It was originally found near 

 Ambleside, and later on near Bowness and near Beddgelert, in North Wales. 

 — Lowe, Our Native Ferns, i., fig. 20. 



P. Y. marginatum — mar-gin-a'-tum (edged), Moore. 



This form of variation, though frequent in Scolopendrium, is very rarely 

 met with in other genera ; its peculiarity consists in the splitting of the 

 epidermis on the margins of the lobes and in its receding, generally on the 



