82 ARKIV FÖR BOTANIK. BAND 13. NIO 13. 



**Subflavesceutes Wain. 

 31. Parmelia Nylauderi n. sp. 



Thallus 6 — 7 cm. latus, laxe adpressus, molliusculus, fra- 

 gilis. Lobi ± distincte radiantes, 4 — 8 mm. lati, contigui vel 

 marginibus undulatis, dein adscendentibus, crispatis, imbri- 

 cati, anguste neque profunde sinuato-incisi; lobuli apice 

 rotuadati vel subtruncati, ciliis brevibus (1 mm. longis), cor- 

 nutis, indivisis vel rarius furcatis, crebre instructus. Thallus 

 minute rugosus, opacus, ambitu solum subnitidus, isidiis 

 destitutus, margine sorediosus, soredia thallo concoloria, 

 prime verrucaeformia, dein glomerata, adscendentia, conflu- 

 entia. Cortex continuus vel fortuito ruptus, color stramineo- 

 flavescens vel sulphureus, subtus ad peripheriam castaneus, 

 nudus, nitidus, ceterum niger, rhizinis nigris, indivisis vel 

 ramosis, 1 — 1,5 mm. longis, 50 — 70 <^. crassis, disperse in- 

 structus. 



Cortex superior 13 — 18 ;j. altus, cinereus vel decolor, strato 

 amorpho tenui (2 [j. alto), tectus, ex hyphis indistinctis, per- 

 pendicularibus, septatis, contiguis, formatus. Medulla alba, 

 100 — 190 [J. älta, hyphae medulläres tenues: 2 [j. crassae, levi- 

 ter adspersae, ramosae, parce septatae. Cortex inferior 13 — 16 

 (25) [J. altus, fusco-niger, ex hyphis membrana mediocri cinctis, 

 luminibus conspicuis separatis, formatus. 



Apothecia desunt; conceptacula pycnoconidiorum nume- 

 rose adsunt, sed fertilia frustra quaesivimus. 



React. Thallus KOH extus flavescit, dein fulvescit, intus 

 e flavo rubescit; thallus Ca(7Z2^2 extus immutatus, intus rube- 

 scens. 



Brasiliae civit. Matto Grosso: Serra da Chapada, pr. 

 Sao Jeronymo. Supra rupes apricas, 3. 6. 1894, no. 2747. 



Die Art steht Parmelia conformata Wain.^ nahe, aber P. 

 conjormata hat Isidien und keine Soredien und eine andere 

 CaCl^Oj-Reaktion (»CaCLO, non reagens» Wain. 1. c). 



32. Parmelia leucoxantha Müll. Arg. 



Müller, J. Lichenologische Beiträge no. 241. Flora vol. 

 XXXIX 1881, p. 85. Wainio React. LichenumaJ. Müll. Arg. de- 



^ Wainio : Etude I, p. 36, in Acta Societatia pro Fauna et Flora fen' 

 nica vol. VII, 1890; Wainio: Lieh. Bras. No. 650b. 



