230 J. TRIANA ET J.-E. PLANCUON. (w. NYLANDER.) 



scente; ad corticem in Nicaragua (hb. Tuckerm.). — Etiam comparetur 

 A.interductœ affinis A. stenographella Nyl., cui thallus macula albida 

 obscure limitata indicatus ; apothecia fusca vel fusconigra (humida palle- 

 scentia) dendritico-ramosa, apicibus acutis (suberumpentibus) ; sporse 

 incolores ovoideae 3-septatse, longit. mm ,015-17, crassit. mm , 006-7, 

 hypothecium incolor, gelatina hymenea iodo cœrulescens (dein sordide 

 violacea et thecse violacée tinctse); in insulis Bonin (hb. Tuckerm.); etiam 

 forma thallo indeterminato ad Hong-Kong in China (hb. Tuckerm.). 



3. Arthonia explan ata Nyl. — Thallus macula albido-vire- 

 scente indicatus (an semper hy pophlœodes ?) , determinatus vel linea 

 fusca cinctus ; apothecia albo-pallida (obsolète albocsesio-suffusa) 

 depressa plana dilatata (latit. 1-2 millim.) difformia (interdum 

 quasi indeterminata, tenuissima); sporse 8 I,œ oblongae vel oblongo- 

 ovoideœ 3-septat9e, longit. mn ,016-18, crassit. mm ,006, hypo- 

 thecium incolor. Gelatina hymenea iodo vinose rubens. 



Ad cortices arborum, prope littus maris (Lindig) (\). 



ù. Arthonia polygramma Nyl. — Thallus albidus vel albus 

 opacus tenuis vel tenuissimus subfarinaceus ; apothecia fusconigra 

 innata plana astroidea vel astroideo-versiformia, conferta, fere 

 mediocria vel minora, tenuiter albo-pruinosa ; sporae 8 uœ inco- 

 lores ovoidese 3-septatae, longit. mm , 017-22, crassit. mm ,007-8. 

 Gelatina hymenea iodo cœrulescens, deinde vinose rubens. 



Bogota, altit. 2600 metr., ad cortices (coll. Lindig. 2784, 817). 



(1) Comparetur Arthonia platyspilea Nyl., cui thallus albus vel albidus tenuis 

 vel tenuissimus, determinatus aut saepius (et typice) fusconigro-limitatus ; apo- 

 thecia testacea vel pallida plana depressa dilatata, nuda vel albo-pruinosa, 

 rotundato-difformia (latit. 1-3 millim.), sœpe subconfluentia ; sporae 8 nae oblongae, 

 utroque apice tenuiores, 7-septatse, longit. mm , 023-30, crassit. mm , 009-41. 

 Gelatina hymenea iodo cœrulescens. In Mexico prope Tampico (legit Uzac), ad 

 corticem RhizophoraeMangles. Affinis Arthoniœ varice (Ach., L. ï/. , p. 259, sub 

 Opegrapha abnormi ut var.), sed major, longe insignior, sporis 7-septatis majo- 

 ribus. Variant apothecia J. platyspileœ testaceo-fuscescentia ; variant con- 

 fluentia; thallus sa3pe rimulosus vel rimosus. A. varia (Ach.) sporas habet 

 3-septatas, sicut supra indicatur. 



