ACOTYLEDONS. LICHENS. SpHoma. 35 



43. HIMANTIA. 

 Creeping, hairy, with branching fibres. 

 1. H. Candida, epiphvllous dehcate white somewhat feathery 



and dilated at the extremity. Pe/^. p. 704. Nees von Esen- 



leck, t. 5./. 72. Btjssus Candida, Light/, p. 1003. Fibril- 



laria stellaia. Sow. t. 3S7.J' !• 

 Hab. On rotten leaves and damp decaying wood, in autumn and 



winter, Lightf. 



Order IT. LICHENS. Ach. 



(LicHENEs, ^cA. Licheves, and part of Hypoxyln, Decand. Part 

 of AlgcB, Juss. Genus Lichen, and some Byssi, Linn.) 



Universal recept. {thallus, crnst or frond,) polymorphous, without 

 roots, perennial, abounding in excessively minute bodies for 

 the purposes of propagation, either imbedded in the substance 

 or scattered upon its surface, or included in peculiar organs, 

 which have been considered thefrnit (partial receptacles, or apo- 

 thecia, by some called shields, or scutella, and tubercles). Jch.^ 



Vegetation. — The Lichens bear a closer affinity to the Fimgi 

 than to any other order. Sometimes they are formed of a 

 simple, pulverulent crust or frond, sometimes membranous, co- 

 riaceous, gelatinous, lobcd, and variously branched ; at all times 

 destitute of leaves. They present various colours, not unfre- 

 quently tending to green. 



Div. I. Idiothalami. Liche?is whose Apothecla are formed of 

 a sulstayice distinct from the Thallus, and different from it 

 in colour. 



Sect. I. Homogenei. Apothecla simple, entirely formed of 

 a nearly uniform pulverulent or cartilaginous substance. 



A. Apothecla destitute of a raised margin. 

 1. SPILOMA. 



Universal receptacle crustaceous, spreading, plane, adnate, uni- 

 form. Partial recept. composed of minute granules collected 

 into a compact, homogeneous^ subpulverulent, naked, variously 

 shaped, coloured mass. 



1. S. tumidulum, crust somewhat cartilaginous whitish, apo- 

 thecla crowded tumid oblong varying in figure roughish red- 

 dish at length brownish black and somewhat pruinose. Ach, 

 Syn. Lich.^p. \. E. B. t.2\o\. 



Hab. On the bark of trees, occasionally, Hopk. 



" " Acharii Sijnopsh Methodica Lichenum" whose arrangemeot and 

 characters are here, with few exceptions, adopted. 



[c 2] 



