CLASS XXII. ORDER V. isr 



4. Recefitaclesjlattenedt nearly destitute of a bor» 

 der ; their upfier side entirely covered luith a thin 

 seed'bearing disk, of considerable solidity at the 

 surface* 



Sticta. Shields on the upper side of the 

 frond, sessile, close-pressed, orbicular, membrana- 

 ceous ; their disk flat, rarely somewhat convex ; 

 their border accessory, thin, entire, free, slightly- 

 tumid, rarely fringed, of the colour of the frond ; 

 pits among the down of the under side, scattered, 

 sessile, minute, coloured : their disk roundish 

 powdery ; border elevated, a little inflated, entire 

 or jagged, sometimes obliterated : frond leafy, 

 membranous, or in some measure leathery, lobed 

 or jagged, downy or shaggy beneath. The pits on 

 the back of the frond form the best of its charac- 

 ters. 57. 2 — sylvatica, (pit-back lichen) glaucous- 

 brown, shields marginal brown. 



Peltidea. Targets closely attached to the 

 frond about the margin on the upper or under 

 side, rarely lateral or towards the middle, each con- 

 sisting entirely of a flattish (rarely concave) colour- 

 ed disk : border accessory, very thin and scarcely 

 discernible, united with the frond and of the same 

 colour : frond rather leathery, with downy veins 

 and fibres beneath, rarely naked ; the circumfer- 

 ence lobed, its barren lobes depressed, fertile ones 

 elongated, ascending, naked at the base* Best dis- 

 tinguished from the sticta by having prominent 

 veins or ribs underneath, and no pits. 57, 2 — ve* 

 nosa^ (target lichen) grey with divergent lobes, 

 targets round brown. 



Cetraria, targets shield-like, thickish, flat, 

 close-pressed, sessile, near the margin ; their cir- 

 cumference loose, rounded, deformed or wavy, 

 disk coloured, slightly convex : border accessory, 



