68 f.LASS XXII. ORDER VI. 



and cracked, or warty, scarcely coloured ; border either 

 none or accessary, which is entire or toothed in the cir- 

 cumference, very often radiated : knobs on the same, or 

 on a different plant, which are sessile, lateral, scattered ; 

 at first shield-like and sometimes in a manner bordered, 

 finally convex and warty, coloured. This is the filamen- 

 tous lichen, tapering, more or less jointed, having a 

 central elastic medullary thread. It is sometimes called 

 tree-moss. 



ORDER VI. FUNGI. 



Jlgaricus. Fungus with laminae underneatfe. 



Merulius. Fungus with veins underneath. 



Boletus. Fungus with pores underneath. 



Hijdnum. Fungus prickly underneath. 



Pexiza. Fungus concave above ; hemispherical or 

 bellform \ seeds contained in the cup. 



Lycoperdon. Fungus becoming powdery and fibrous 

 within : seeds attached internally to the fibres. 



Uredo. Fungus parasitical, consisting of a mealy pow- 

 der, destitute of a case, growing from under the cuticles 

 of leaves and stems, bursting at last, with an even mar- 

 gin. 



Mucor. Fungus fugacious, heads at first semi-trans- 

 parent, then becoming opake, fixed to simple or branch- 

 ed stalks. 



Xylostroma. Fungus leathery, expanded, deformed, 

 penetrating, smooth^ even : seeds among the fibres, glo- 

 bular minute. (Growing in cleavages of decaying wood.) 



