70 CLASS XXI. ORDER VI. 



iaining the fruit immersed, in them, generally strung on threads ; mostly oj a 

 grass-green or greenish colour, sometimes purple. They grow in fresh water 

 streams, springs, ditches, and stagnant waters ; sometimes in damp woods, a-ad 

 some in the sea. 

 Confer"va. Filaments articujated, uniform, simple or branched, containing 



the seed within them. No external fruit. 



E. The section TREMELLiNiE comprises the old genus Tremella. Plants of thii 

 section are all gelatinous, hyaline, and covered ivith a membrane. They are 

 globose, palmate, or filiform. ; and contain conferva-like filaments within. Colour 

 green or purplish. They resemble Confervoidece in habit and place of growth. 

 Nos"toc. Flamentsmoniliform, constituted from coadunate globules. Fronds 



bullate, vesicular, (at length becoming flattened,) crowded with simple monili- 



form, curve-crisped filaments. 



ORDER V. LICHENES. 



Gyroph"ora. Frond foliaceous, coriaceous-cartilaginous, peltate, monophyl- 

 lous, (when luxuriant, polj^phyllous,) free beneath; apothecia some. vhat shield- 

 form, sessile-adnate, clothed with a dark membranaceous cartilage, including a 

 somewhat solid parenchymous substance; disk warty or circinal, plicate and 

 margined. 



Parme'lia. Frond coriaceous, sub-membranaceous, flat, expanded, close- 

 pressed, orbicular, stellate and lobed, or multifid-laciniate, having fibres b°neath; 

 apothecia shield-form, sub-membranaceous, formed under side from the frond, 

 free, with a central puncture by which it is afilxed ; disk concave, coloured, 

 covering the whole receptacle above, within similar, sub-cellular, and striate, 

 cut rotmd, inflexed with a frond-like margin. 



Cetra'ria. Frond cartilaginous or membranaceous, ascending or expanded; 

 lobe laciniate, smooth and naked both sides; apothecia shield-like, obliquely 

 attached to the margin of the frond, the lower free, being separated from it, 

 the upper one sessile; seed bearing lamina forming the disk, coloured, plano- 

 eohcave, surrounded with a frohd-like inflexed margin. 



Cenomy'ce. Frond crusty or cartilaginous, foliaceous, laciniate, sub-imbricate 

 free, (rarely adnate ;) bearing sub-fistulous peduncles {podctia)hoth barren and 

 fertile ; receptacles (knobs) orbicular, without margins, at length convex and 

 capitate, inflated or empty beneath, terminal attached to the peduncles by their 

 peripheries ; seed bearing lamina forming the receptacle above, thickish, col- 

 oured, similar within, convex, reflexed, and attached at the periphery, invested 

 beneath with the woolly integument of the frond. 



B.i:omy'ces. Frond crustaceous, flat, expanded, adnate ; bearing soft, solid, 

 fertile podetia ; apothechia capitate, without margins, solid, terminal, sessile on 

 the peduncles ; seed bearing lamina covering the whole receptacle and adnate 

 to it, convex reflexed, thickish, coloured, similar within. 



Us"nea. Frond sub-crustaeeous, teretish, branched, mostly pendulous ; cen- 

 tral part hyaline, elastic, composed of fasicles of tubes ; receptacles orbicular, 

 terminal, peltate, formed wholly from the frond, covered all over with its corti- 

 cal substance, similar, nearly of a uniform colour; its periphery destitute of 

 margin, but often surrounded by a ciliate edging. 



ORDER VI. FUNGI. 



Lycoper'"don. Receptacles somewhat caulescent, at length bursting at the 

 top, with scaly warts or prickles scattered over its surface, especially when 

 young. Seminal dust green. 



Mu'coR. Receptacle membranaceous, globose, stiped, at first watery and pel- 

 lucid, then opake ; seeds naked, sub-cohering. Very minute and fugacious, 



Ure'do. Receptacle 0; seminal dust under the cuticle of leaves and stems, 

 when ruptured it is easily brushed off'; the little masses of seeds uniform, 

 mostly globose. 



Agar"icus. Destitute of a volva at the base of the stipe, with or without the 

 ring ; lamellffi either entire or with shorter ones intermixed, rarely simple ra- 

 mose. Never veiny. 



Bole'tus. Pileus various tubes and pores terete, entire. A large genus. 



