( -iU-l ) 



Frequentissima est in (rallia ad cortices heves vel la!viores (ubi 

 thallo fere effuso albo, subfarinoso , ad platanos'formam ;;/a<a- 

 noidem Del, in occidenlali offert) , rarius ad ligna aut saxa cal- 

 carea vel muros (Op. Chevalieri Leight. Br. Graph, p. 10, L. 

 Br. exs. 67; Op. lilhyrga Ach. L. U. p. 247, Syn. p. 72 pr. p.). 

 Apolheciis epithecium facile deplanatum exhibentibus abit in 

 varietateni hai-aleam (Op. hapalea Ach. Syn. p. 79 ; Op. steno- 

 carpa var. hapalea Ach. L. U. p. 267; Op. depressa Ach. L. U. 

 p. 262; Op. rimosaDC. Fl. Fr. 2. p. 312, Duf. Journ. Phys. 

 1818, p. 215; Op. atra Moug. St. Vog. 649; Op. atra var. abbre- 

 viatu Fr. L. E. p. 367 pr. p.; Op. aira var. bullata Schar. L. H. 

 586 (1) ), ad juglandes prajsertim obvia. 



12. O. lenti<|iiiosa Lyell , Leight. Br. Graph, p. 26, t. 6, f. 16. 



T hall us vix ullus , modo macula indicalus alba epidermidis ad 

 corticem , cui adnascitur, linea obscura limitata , apothecia 

 parva nigra oblonga vel oblongo-linearia recta siniplicia, epithecio 

 rimiformi; sporae fuscaj ovoide;e uniseptatoe (loco septi ssepe 

 pauxillum constrictse), longit. 0,011-16 millim., crassit. 0,006-7 

 millim., paraphyses non distinctse, hypothecium infra satis crasse 

 nigrum. Gelatina hymenea iodo dilute vel vix ccerulescens , pro- 

 toplasma thecarum vinose rubens. — Ad corticem prope Fougeres 

 GallicE occidentalis (lib. Lenorm.). (Ad fagos et ilices Angliae , ex 

 Leight. 1. c). Aflinis est Op. atne , sed sporaj fere Arlhonioi vel 

 Mdanolhecce. Apothecia majora longit. 0,5 millim., crassit. 0,18 

 millim. , subsimilia ssepe iis Op. minuke Chev. (Etiam in Guyana 

 gallica adest). 



13. O. vulgata Ach. Meth. p. 20, L. U. p. 255, Syn. p. 73, Sm. 



E. Bat. t. 1811 , Fr. L. 's. exs. 280, Leight. Br. Graph, p. 22, 



t. 5, f. 13; Op. atra var. vulgata Schaer. Enum. p. 154, L. H. 



516; Op. alrayar. stenocarpa Fr. L. E. p. 367 pr. p.. Tuck. 



• Exs. 75; Op. filicina Mont. Cub. p. 184, t. 9, f. 1, Syll. p. 350 



(1) Hue pertinent Chevalieri Op. atra var. dubia in Fl. Par. p. 522, Op. gibba et 

 Crustacea ibid. p. 523. — Addalur hie obiter, thecas in Op. aha esse, ul in Arltio- 

 niis, pyriformes, pariete superne incrassalo, unde observatori superficiali vel in rebus 

 microscopicis parum versato sporis cavitatem earuni non repleri apparere possit ; nam 

 cavitas h;eccej'inidum (verliccm) thecse non astingit. 



