254 



THE BOOK OF CHOICE FERNS. 



fronds, deltoid and trii^innatifid (in shape of tlie Greek delta, A, and three 

 times divided half- way to the midrib), are 2in. to 3in. each way ; they are 

 produced from a very slender, creeping rootstock, and are borne on stalks 

 4in. to 6in. long. The lower pair of leaflets, which are much the largest, 

 are unequally triangular and cut down to the midrib ; their closely- set upper 

 segments are strap-shaped and blunt, and form pecuHar, lobe-hke wings along 

 the rachis (stalk of the leafy portion) and midribs. The leaflets are hispid 

 with straight, white, jointed hairs on their upper surface, and woolly beneath. 

 The sori (spore masses), hidden by the tomentum (woolly substance), are 

 disposed in long lines along the veinlets, — Hooker, Synopsis Filicum, p. 516. 

 Nicholson, Dictionary of Gardenin</, ii., p. 104. Eaton, Ferns of North 

 America, ii., t. 48. 



Fig. 62. Frond of Gymnogramme Hookeri 



{\ nat. size). 



G. (Eugymnogramme) Hookeri — Eu -gym-nog-ram'-me ; Hook'-er-i 

 (Hooker's), /. Smith. 

 This very distinct, stove species, native of the Andes of New Granada 

 and Boli-^da, has the habit of G. tartarea ochracea, but the yellow powder is 

 replaced by a coating of a rusty-brown, woolly substance, which is not only 

 observed on the under-part of the frond itself, but extends to the firm, dark 

 chestnut-brown stalks, 4in. to 6in. long, on which they are borne. The fronds 

 (Fig. 62) are 9in. to 15in. long, 4in. to 5in. broad, oblong-spear-shaped, and 



