96 LICHENS. 



Sectio V. — RINODINA Acliarius 

 Lichenographia iiniversalis, 1810, p. 341. 



66. Lecanora Petermannii IIuo ; sp. nov. 



Thallusvel obscure caslaiieus, vel isabellinus aut etiam pallidi^ alu- 

 taceus, niadefaclus rubricosus, plus minusve albido pruinosus, plagulas 

 nunierosas, interruptas, aliis Lichenibus cruslaceis scparatas, ambitu 

 sa?pe radiantes, nunc crassitudine médiocres, nunc multum crassas, ina-- 

 quatas corrugatasque t'ormans atque laciniatus ; laciniie in peripheria 

 radiantes 0,3-0, a mill. lata^ contigufo, plante, ramosa.' seu etiam digitatai 

 ac in apice truncataî aut aliquando teretes ; in centro nunc brèves, nunc 

 paulum longa.', 0,o-0,6 mill. crass*, convexfe, passim teretes, torulosa^, 

 in superficie rugulosœ, superposit* ac connexœ atque non raro verruci- 

 formes; intus albidte ac tribus reagenlibus immutatai ; infernefuscescentes 

 ac inbasi fuscoatra;. Cortex superne etiateraliterlacinulasvestiens, fuscus 

 vel fuscorubens et 20-30 [j. crassus; ejus hyphai fastigiatœ, 5-6 y. crassœ, 

 capitata; capite 4-8 [j. crasso, sœpe capitato ramosœ, supra gonidia ramosœ 

 ac inter eorum glomerulos simplices, arcte coadunata;, articulatte arliculis 

 sphaToideis, lumine 2,o-4 p. lato, atque zona alba 20-30 u. crassa cellulas 

 protoplasmatis inopes continente tecta;. Gonidia pallide viridia, cystococ- 

 coidea, l2-20;j.lata, membranaparum crassa, glomerulos liypharumfasci- 

 culis 20-S0;j. latis separatossub cortice formantia ac in mcdullam solitaria 

 passim descendentia. llyphaimedullares verticales, stricte coalita*, parum 

 ramosse, sphairoideo aut oblongo articulalai, lumine triplici Dri» Cnié- 

 guen passim rubente ac in parte colorata pannum plectenchymaticum, 

 praibentes. Apothecia 0,o-l ,3 mill. lata, rotunda, supra lacinias sessilia, 

 inbasi constricta,excipulolaivietthalloconcolore, margine parum crasso, 

 intcgro et parum prominente atque disco fusco aut fusco atro, piano et 

 la;vi, demum convexo, aspero nudoque instructa. Excipulum 190-200 y. 

 crassum, thallo continuato formatum eique structura omnino similis. 

 Pcrithecium non coloratum aut in centro apothecii fuscescens, iodo non 

 tinctum, lateraliter et subtus 20-10 [j. crassum, ex hyphis in margine fla- 

 bellatis, subtus hoiizontalibus ac in lamina commissurœ punctuni secanic 

 in centro verticalibus, stricte coalitis et breviler articulatis constans. 



