;iss BOTANY OF SOCOTRA. 



3. MICROTHELIA. 



Wcrothelia, Korb. Sysfc. 372 ; Th. Fries Heterol. Ill ; Stitzb. Beitr. 147. 

 Verrucaria, Nyl. pr. p. 



A small genus, widely dispersed. 



M. micula, Korb. Syst. Lich. Germ. p. 373 (1855). 



Socotra. Corticola ad ramulos. B.C.S. n. 1410. 

 Distrib. Europe (not rare), North and South America. 



4. PYRENULA. 



Pyrenula, Stitzb. Beitr. 148. 

 Pyrenula et Blastodesmia, Mass., Th. Fries. 

 Verrucaria, Nyl. pr. p. 



A genus with numerous and some very common tropical species, a few are 

 European. 



P. obscurata, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 471. 



Thallus pro genere erassus, subcartilagineus, olivaceo-fuscus, superficie undulato-insequalis ; 

 gonidia rhomboidea, depauperato-concatenata, aurea, rarescentia; apothecia spersa, distantia, 

 omnino immersa, primum obtecta, demum vertice anguste v. subanguste nuda, atra, vertice 

 nitidula et demum minute umbilicato-pertusa ; perithecium integrum, globosum, undique 

 crassum et basi crassius, totum in sectione fere \ {-\qq) rnm. latum; paraphyses tenellse, 

 capillares ; asci cylindrici, 8 spori ; sporae fuscae, 23 fj. longae, 10-12 /j. latae, 4-loculares, 

 loculi intermedii rhomboidales, terminales obconici. 



A proximis P. cerina {Verrucaria cerina), Eschw. Brasil. p. 133, et a P. hypophyta (Verrucaria 

 hypophyta, Nyl. in Prodr. Nov. Granat. p. 119) pnesertim thallo omnino alio et apotheciis 

 majoribus differt. 



A P. pwnctella (Verrucaria punctella, Nyl. in Prodr. Nov. Granat. p. 119) similiter et sporis 

 minoribus recedit. 



Socotra. Corticola ad ramos. B.C.S. n. 1354. 

 Distrib. Endemic. 



5. ANTHRACOTHECIUM. 



Anthracothecium, Mass. Esam. compar. 49 ; Mull. Arg. Lich. Afric. occid. n. 52. 

 Verrucaria, Nyl. pr. p. 



A genus of the warmer regions, having quite the habit of Pyrenula, but 

 provided with parenchymatous (brownish) spores. 



