380 BOTANY OF SOOOTRA. 



cfassiusculo fusco v. fuscescente reprEesentatum. Asci 8-spori. Sporse hyalinse, 23-26 /x 

 longa?, 8 [x. latre, ambitu anguste subsoleseformes, utrinque obtuste, 8-loculares, loculi 

 transversim 2-3-locellati. 



Prima fronte Opcgrapliam variant simulat, sed discus pruinosus, sporse omniuo alise et peri- 

 thecium dimidiatum est. In vicinitate locanda est Graphince Jlexitosce, s. Graphidis 

 jtexuoscc Fee in Bull. Soc. Bot., 21, p. 25, cujus sporee multo minores et ambitu latiores et 

 apothecia alia. 



Socotra. B.C.S. mi. 1313, 1316, 1337, 1338, 1354, 1356, 1363. In 

 ramulis Dracsense prope Wadi Kischen, alt. 700 m. Schweinf. 

 Distrib. Endemic. 



2. G. socotrana, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 468. 



Diorygma socotrimim, Mull. Arg. loc. cit. 



Thallus tenuis, e pallido-argillaceo albus. continuus, laevis, subpulverulentus; apothecia thalli 

 labiis adscendenti-conniventibus emergentibus recepta, £ mm. longa, ssepius triente longiora 

 quam lata, simplicia, elliptica, utrinque spurie acutata, rarius rudimentarie uniramulosa, in 

 sectione fere £ mm. lata ; perithecium byalinum, tenue ; margines thallini in sectione 

 tenues, fere hyalini, sicci medio biantes, madefacti discum latum et planum tumescentem 

 carneum sed ctesio pruinosum mox detegentes ; epithecium hyalinum, copiose byphe- 

 moideo-granulosum, lamina coeterum undique cum bypotbecio hyalina ; asci 2-6-spori ; 

 sporse byalinse, 27-40 /x long?e, 13-16 /x latse, ambitu varire, loculi 6-10 parenchymatici, 

 locelli loculorum transversim siti 3 v. ssepius 4. 



Habitu accedit ad Graphinam hololcucoidem, sc. Graphidem Jwloleucoidem, Nyl. in Prodr. Nov. 

 Granat. p. 135, sed prseter alia sporis gaudet duplo et ultra minoribus et disco non crasse 

 albo-velato. 



Genus Diorygma retineri non potest, margo enim proprius adest byalinus et tenuis, thallo ipso 

 spissior. 



Socotra. Ad corticem arborum. B.C.S. n. 1461. 

 Distrib. Endemic. 



8. ARTHONIA 



Arthonia, Th. Fries, Heterol. 96 ; Mull. Arg. Lich. Geneve 70 ; Stitzb. Beitr. 152. 

 Arthonia, Ach. pr. p. et Auct. pr. p. 



A great genus, much dispersed everywhere ; some species are extremely 

 common, and very widely diffused. 



1. A. cinnabarina, var. adspersa, Nyl. in Prodr. Nov. Granat. p. 96. 



Socotra. Ad arborum truncos. B.C.S. n. 1467. 

 Distrib. Common in warmer and subtemperate regions. 



