— 82 -- 

 tenue; asci oblongo-obovoidei , tenelli, gibboso-irregulares, 8-spori; 

 sporœ (simplices) 8-10 y. longœ, 8 [t. latœ, vulgo regulariter globosœ 

 V. globoso-ellipsoidea^ , inlense fusc;e; gonidia globosa , diatnetro 11- 

 16 {ji aequantia. — Extus Stigmatomma porphyreum Koeib. simulât, 

 sed areola) tenuiores et sponc simplices, regulariter octonco. — Habi- 

 tat in summo Gebel Cheschen in Wadi Gendel inter Cairo et Sues, 

 parcissime visa , et quidem supra thallos crustaceos aliorum Liche- 

 num supersparsa ibique quasi insulatim crescens : Schweinf. 



61. Verrucaria isitc^ra f. liiuitaiis Nyl. Licli. Ehrenb., 

 p. 65, ad lapides Pyramidis Gyzensis primœ : Ehrenb. 



62. "V. aegyptiaea Mail. Arg. , thallus insulatim crescens, 

 effusus, crassiusculus, in areolas reticulatim diffractus. v. demum dis- 

 perso-areolotus, coerulescenti-fuscus, demum expallens , areolœ cire. 

 1/3 -1/5 mm. lateu, obtuse angulosse, planœ, margine nonnihil elevatœ 

 V. minores convexœ, medio cœsio-pruinosœ v. demum undique cai-sio- 



i 

 expallentes; ajiothecia in quaque areola 1-3, innata, globosa, ^ mm. 



t 1 

 lata, parte émergente ô -tt, mm. lata, prœter partem emergentem 



nigram undique hyalina , dein dimidio et ultra emergentia et nigra , 

 opaca, demum vertice pertusa ; parapbyses subindistinctio, brèves et 

 molles; asci brèves et ambitu lati, 8-spori ; sporce 8-13 [a longaî, 6-7 

 (A lata3, ambitu satis ludentes. — Proxima V. glaucinaj Acb. , sed 

 thalli coloralius, areoUe obtuse angulosœ, apotbecia minora, demum 

 multo magis exserta et spora) minores. Habitu et apotheciis satis V. 

 lecideoidem b. minutam Koerb. simulât, sed apotbecia ex ipsis areo- 

 lis nec e fissuris tballi oriuntur. — Calcicola in desertis Wadi Cherese, 

 "Wadi Na-umieb superiore, et in Wadi Nebieh : Schweinf. 



63. Thelidiuin pauperculum Midi. Arg., thallus albus , 

 V. argillaceo-albus, tenuis, minutissime glebulosus, subleprosus ; apo- 

 tbecia in glebulis sœpius solitaria, 1/10-1/8 mm. lata, globosa, intè- 

 gre nigra , primum leviter emergentia, demum semiemersa, nigra et 

 opaca, sub microscopio nonnihil coeruleo-virentia; parapbyses capilla- 

 cea), firma), tenellœ ; asci-cylindrici, 8-spori; sporu^ 16-20 [x longic, 

 4-5 [X latœ, 2-loculares, latiuscule fusifo.rmes, utrinque sul)attenuata^; 

 gonidia vera globosa, cire. 20 p. lata. — Verrucaria ca:>sia Nyl. ex des- 

 cript. salis accedere videtur sed sporis majoribus et Ihallo cœsio gau- 

 det. — Genus Thelidium admisse sensu etiam illas Sagedias et Acro- 

 cordias Auct. conlinet qu:e gonidiis veris pra^dilte sunt. — Th. pau- 

 perculum crescit calcicolum in deserto Wadi Cherese : Schweinf. 



, SPECIES INVESTIGAND.E 



IIUCUSQUE QUOAl) CHARACTERES EXTERIORES TANTUM NOT.K. 



64. (( Urccolaria oonferta » Del. Flore d'Egypte , p. i55, 

 t. 59 fig. 4. et Flor;.' ;egypt. Illuslr,, p. 32, n. 078, ad lai.ides in edi- 

 tioribus vallée d'Egarement inter Milum et Mare Piubrum : Del. 

 (nuperrime in hb. Del. inveniri haud potuil). Forte species Buellia;. 



