376 BOTANY OF SOCOTRA. 



6. O. Bonplandi, Fee" Ess. p. 25. 



Socotra. In ligno decorticate B.C.S. mi. 1317 pro parte, 1337 pro parte. 

 Distiub. America and Bengal. 



7. O. Dracsenarum, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 466. 



Thallus sat tenuis, albus, laevis, superficie nonnihil farinosus, demum rugulosus, rnargine zona 

 nigrescente cinctus. Apothecia \ mm. lata, pluries longiora quara lata, demum saepe 

 eloiigato-linearia et varie flexuoso-curvata, primum plane innata, anguste emergentia et 

 thallo tecta, demum denudata sed non emersa, atra, opaca, rima angusta depressa albo- 

 pruinosa v. demum atrata aperientia ; perithecium integrum, margines angusti, non sul- 

 cati; bypothecium fuscum. Sporae in ascis octonae, hyalinse, demum nigrescentes, 15 /x 

 longae, 4 /x latae, fusiformes, utrinque obtuse attenuates, 4-5-loculares, loculi aequilongi. 



Primo intuitu formam tenellam Graphidis scriptce, Acb. v. serpentina} simulat, sed structura 

 est Opcgraphce. Etiam Platygraphas stenocarpas, Mull. Arg. simulat sed perithecium 

 completum est. 



Socotra. In ramis Draccenarum cum multo validiore et emersa Graphina 

 variante, Mull. Arg. supra Wadi Kischen, alt. 700. Schweinf. 

 Distrib. Endemic. 



8. O. microspora, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 467. 



Thallus flavescenti-albus, subtenuis, laevigatas et continuus, dein rimulosus, demum evanescens 

 et maculam albidam relinquens, evolutus linea nigra cinctus. Apothecia saepius conferta, 

 in thallo evoluto semiimmersa, dein thallo evanescente superficialia, \ mm. lata, demum 

 2 mm. longa, subsimplicia, primum promiuenter et conniventer marginata, dein latius 

 aperta et discum albo-pruinosum gerentia, demum late aperta, marginibus non prominenti- 

 bus et disco piano denudato-nigro distincta ; perithecium crassum, basi subtruncato-rotun- 

 datum ; epithecium fuscum ; lamina hyalina. Asci cylindrici et 8-spori. Sporas dacty- 

 loideaB, 11-13 (-15) /j. longa?, 3-3^ /m. latae, 3-5-septata3. 



Juxta 0. dijftciliorem, Nyl. ap. Cromb. Lich. Ins. Eodrig. in Linn. Soc. Journ. xv. p. 443, 

 locanda est. 



Socotra. Corticola. B.C.S. nn. 1316 pro parte, 1338 pro parte, 1432 

 pro parte. 



Distiub. Endemic. 



9. O. sororiella, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 467. 



Thallus tenuissimus, indeterminatus, argillaceo-albus, loevis, subfarinulentus; gonidia concatenata, 

 oblongata, circ. 12 /x longa. Apothecia subsessilia, \\-1\ mm. longa et -£- mm. lata, 

 linearia, arcuato-curvule, simplicia v. 3-4-radiantia, ad extremitates nunc acuta nunc 

 obtusiora, pro latidudiue sat elata, undique nigra et opaca, nurla; margines integri, sub- 

 obtusi, statu sicco arete conniventes; discus madefactus angustus, planus, niger; lamina 



