368 BOTANY OF SOCOTRA. 



Biatorina, Bilimbia, Bacidia,Ehaphiospora,Scoliciosporum, Catillaria, Sagiolcchia, Korb. et Massal. 

 Lecidca, Ach. pr. p., Nyl. pr. p. 



A large genus wliicli is richly represented in all regions. The distinctive 

 character of this genus is that the hyaline developed spores are never uni- 

 cellular nor parenchyinatic, but divided transversely. Not the number of 

 spore-cells, but the principal of the spore division, has generic value. All 

 the Socotran species are new and endemic. 



1. P. (Biatorina) obfuscata, Mull. Arg.Proc. Roy. Soc. Edin. xi. (1882), 463. 



Thallus effusus, tenuiter tartareo-leprosus, rimoso-areolatus, obscure rufescenti-fuscus v. demum 

 in hypothallo nigrescenti-maculari subnullus. Apothecia sessilia, ^ mm. lata, primum crasse 

 dein tenuiter marginata, plana, margo primum cum thallo concolor, fuscus, mox nigrofactus, 

 semper integer ; discus semper niger et planus, opacus, nudus ; epithecium fuscum, lamina 

 circ. 50 /ul alta, cum hypothecio hyalina; paraphyses sat liberae, superne incrassatae et 

 fuscte, distiucte articulatse. Asci obovoideo-cylindrici, apice valde pachydermei, 8-spori. 

 Sporae 18 /j. Iongae, 2\ fx latae, valide subrecto-bacillares, 2-loculares. 



Juxta Patellariim lenticularem, Mull. Arg. inserenda est. Primo intuitu etiam Patellariam 

 chalybeiam, Mull. Arg. simulat, sed hypotheeium, margo, et ambitus sporarum omnino 

 recedunt, apothecia madefacta molliora sunt quam in sect. Catillaria et apothecia novella 

 margine haud omnino nigra sunt. 



Soeotra. Ad saxa quartzosa. B.C.S. n. 14:02 pro parte. 

 Distrib. Endemic. 



2. P. (Catillaria) sigmoidea, Mull. Arg. in Proc. Roy. Soc. Edin. xi. 

 (1882), 463. 



Thallus irregulariter evolutus, tenuiter tartareus, primum continuus, dein distincte rimoso- 

 areolatus, v. demum subdiffracto-areolatus, lacteo-albus, hinc inde autem v. fere undique 

 hypothallo perspicuo coerulescens. Apothecia nigra, intus interne atro-grisea, sessilia, 1 mm. 

 lata, primum crasse et prominenter nigro-marginata, discus planus et concolor, demum 

 convexus et margine tenui integro cinctus ; epithecium aeruginoso-atrum, lamina vinoso- 

 fusoescens, superne olivaceo-virens ; hypotheeium crassum, atrofuscum. Sporae hyalinae, 

 2-loculares, fusiformi-ellipsoideae, utrinque acutatae et sigmoideo-curvatae. 



Soeotra. Ad saxa quartzosa. B.C.S. n. 1402 pro parte. 

 Distrib. Endemic. 



3. P. (Bacidia) socotrana, Mull. Arg. 



Similis P. endoleuca;, Mull. Arg. (pro qua earn primum habui), sed minor, apothecia prominenter 

 crasso-niarginata, epithecium fusco-atrum, hypotheeium crassum, cupreo-fuscum et sporae 

 angustiores. Thallus albidus, granuloso-inaequalis, linea nigra cinctus. Apothecia |-1 

 mm. lata; lamina fulvescens. Sporae 62 /u. longae, 3-3£ /j. latae, 9-13-septatae. 



Soeotra. Ad ligna emortua. B.C.S. n. 1465 pro parte. 

 Distrib. Endemic. 



