LICHENES — VR JEAN MULLER, 375 



3. O. (Lecanactis) elegans, Miill. Arg. in Proc. Roy. Soc. Edin. xi. 

 (1882), 466. 



Thallus calceo-albus, tenuis, hevis v. minute verrucosus, margine zona fusca demum obsoleta 

 cinctus. Apothecia primurn orbicularia, plana, non emersa et dense caesio-pruinosa, dernum 

 3-6-plo longiora quam lata, curvata v. subrecta, haud raro stellatim 3-brachiata, evoluta 

 £-£ mm. lata, et subprominenter nigro-marginata, discus planus, demum pruina rarescente 

 caesio-niger; parapbyses irregulares, laxe intricatim ramoso-connexae. Asci 8-spori, angusti. 

 . Sporae 18-27 //. longae, absque balone 4 ju latae, fusiformes, (5-) 7-8-septatae, utrinque obtuse 

 angustatae. 



Proxima 0. lyncece, Fries, a qua differt thallo albiore, apotheciis gracilibus et sporis brevioribus. 

 Similiter etiam recedit ab affini 0. Martii, Nyl. Licb. Kurzian. Calcutt. p. 5. 



Socotra. Ad ligna decorticata. B.C.S. nn. 1461 pro parte, 1465 pro 

 parte, 1467 pro parte. 

 Distrib. Endemic. 



4. O. (Lecanactis) subcalcarea, Miill. Arg. in Proc. Roy. Soc. Edin. 

 xi. (1882), 466. 



Thallus tartareus, crassiusculus, limitatus, continuus et laevigatus, demum rimoso-areolatus, 

 virescenti-albus, intus cretaceo-albus, non zona disclore cinctus. Gonidia chroolepoidea. 

 Apothecia circ. -|- mm. lata v. paullo crassiora, omnino immersa et primum regulariter 

 orbicularia, plana, caesio-pruinosa v. demum nigrescentia, margine valido haud prominente 

 cincta, demum breviter et radiatim v. irregulariter obtuse 2-3-ramulosa; hypothecium 

 atro-fuscum, validum ; lamina hyalina. Asci angusti, 8-spori. Sporae (hyalinae) dacty- 

 loideae, 4-6-loculares, 20-25 /j. longae, 5 /x latae, utrinque, nonnihil obtuse angustat. 



Juxta Lecanactidem Dillenianam, Korb. locanda est. Primo intuitu fere accurate Siegertiam 

 calcaream, Korb. simulat. 



Socotra. Ad saxa calcarea. B.C.S. n. 1324. 

 Distrib. Endemic. 



5. O. (Lecanactis) cretacea, Miill. Arg. in Proc. Roy. Soc. Edin. xi. 

 (1882), 466. 



Thallus crassiusculus, subfarinoso-tartareus, continuus, demum obiter rimoso-areolatus, junior 

 laevigatus, dein farinulentus, cretaceo-albus, margine linea ccerulescenti-nigra v.-fusca 

 cinctus. Apothecia primum innata et satis similia iis Op. subcalcarece, orbicularia, pruinosa, 

 magis evoluta subinnato-sessilia, mox angulosa et reniformia, caesio-velata, margo ascute 

 prominens et niger, latere extus albo-farinulentus ; hypothecium crassum, nigro-fuscum. 

 Asci 8-spori. Sporae (hyalinae) anguste dactyloideae, 30-34 /jl longae, 4-5 /a. latae, 7-9- 

 septatae, articuli sublatiores quam longi. 



A subsimili 0. subcalcarea, Miill. Arg. differt apotheciis emersis, demum prominenter anguste 

 marginatis, sporis majoribus et magis divisis. 



Socotra. Ad saxa calcarea. B.C.S. n. 1333, 1338 pro parte. 

 Distrib. Endemic. 



