476 



■THE BOOK OF CHOICE FERNS. 



terminal pinna (leaflet) and two lateral ones at their base ; these pinna; are 

 from 4in. to 6in. long, and, like the much longer central or terminal 

 ones, are furnished with closely-set pinnules (leafits) which are very 

 unequal-sided, sharp-pointed at the end, and deeply toothed on the edges. 

 The texture is soft and the colour light green. The very abundant sori 

 (spore masses) are disposed principally in two rows half-way between the 

 midrib and the edge of the fertile pinnules. — Hooker, Species Filicum, iv., 

 p. 15. Nicholson, Dictionary of Gardening, i., p. 127. 



Fig. 74. Frond of Aspiclium tripteron 



nat. size). 



A. tsus-simense — tsus-sim-en'-se (from Tsus-Shna), Hooker. 



This is probably only a slender form of A. aculeatum, of a particularly 

 compact habit and dark green colour. 



A. (Polystichum) Yarium — Pol-ys'-tich-um; var'-i-um (variable), Swartz. 



A greenhouse species, hardy in some favoured localities ; it is a native 

 of Japan, and its habit is intermediate between that of a Lastrea and that 

 of a typical Polystichum. The thick, leathery fronds, 1ft. to ljft. long and 

 9in. to 12in. broad, borne on stalks 6in. to 7in. long and densely scaly 



