526 PYEENULACEAE. 



3. PSEUDOPYRENULA Muell. Arg. 

 1. Pseudopyrenula diremta (Nyl.) Muell. Arg. Flora 66: 249. 1883. 

 Verrucaria diremta Nyl. Act. Soc. Sci. Fenn. 7: 492. 1863. 

 On bark, New Providence : — Cuba ; Venezuela ; Colombia ; Brazil. 



4. PYRENUIiA Ach. 



Perithecia dimidiate. 



Perithecia spreading: at tbe base and entirely nudate. 1. P. mamillana. 



Perithecia not spreading, immersed when young, then emergent. 2. P. leucoplaca. 

 Perithecia subglobose. 



Thallus orange-brown. 3. P. cerina. 



Thallus more or less olivaceous. 



Perithecia immersed in the thallus. 4. P. punctella. 



Perithecia emergent to superficial. 5. P. Glaziovii. 



1. Pjrrenula mamillana (Ach.) Trev. Conspect. Verr. 13. 1860. 



Verrucaria mamillana Ach. Meth. Lich. 120. 1803. 

 Verrucaria Santensis Tuck, apud Nyl. Expos. Pyren. 45. 1858. 

 Verrucaria Kunthii Fee, Essai Crypt. 88, pi. 34, f. 4. 1824. 

 Pyrenula Kunthii Fee, Suppl. Essai Crypt. 80. 1837. 

 Pyrenula deplanata Muell. Arg. Bot. Jahrb. 6: 411. 1885. 



On bark. Great Bahama and New Providence : — widely distributed in tropical 

 and subtropical regions of both hemispheres. 



Pyrenula mamillana is an exceedingly variable species. P. Kunthii is the form 

 with the larger perithecia and spores, that is the more luxuriant form ; w^hile P. 

 deplanata is the less luxuriant form with the smaller perithecia and spores. But 

 intergradations of all sizes are to be found commonly. 



2. Pyrenula leucoplaca (Wallr.) Koerb. Syst. Lich. Germ. 361. 1855. 



Verrucaria leucoplaca Wallr. in Bluff and Fing. Fl. Germ. 3: 299. 1831. 



On bark of Casasia clusiaefolia. Little San Salvador : — widely distributed in the 

 temperate regions of both hemispheres. 



3. Pyrenula cerina (Eschw.) Muell. Arg. Flora 67: 667. 1884. 



Verrucaria cerina Eschw. in Mart. Fl. Bras. 1: 133, 1833. 

 Pyrenula aurantiaca Fee, Suppl. Essai Crypt. 82, pi. 37, f. 1. 1837. 



On bark. New Providence and Crooked Island : — widely distributed in tropical 

 America. 



4. Pyrenula punctella (Nyl.) Muell. Arg. Flora 65: 400. 1882. 



Verrucaria punctella Nyl. Expos. Pyren. 46. 1858. 



On bark of Drypetes, Cay north of wide opening, Exuma Chain : — South Caro- 

 lina ; Colombia ; Java. Probably generally distributed but confused with the well- 

 known Pyrenula nitida (Weig.) Ach., from which it differs in the more completely 

 immersed perithecia and the larger spores. 



5. Pyrenula Glaziovii Muell. Arg. Mem. Soc. Phys. Hist. Nat. Geneve 30^: 32. 



1888. 

 On bark. New Providence, along Soldier's Road : — Brazil. 



5. MICROTHELIA Koerb. 



1. Microthelia CLuadriloculata Eiddle, sp. nov. 



Thallus epiphloeodes crustaceus uniformis effusus, albidus opacus, tenuis 

 rimulosus. Gonidia chroolepoidea. Perithecia Integra globosa, minuta ad 0.4 

 mm. lata, superfieialia basi thallino-tecta, superne nuda nitida, apice convexo 

 aut minute umbilicato. Paraphyses persistentes distinctes ramoso-connexae. 

 Asci oblongi 8-spori. Sporae in ascis 2-3-seriales fuscae oblongae aut fusi- 

 formes, 4-loculares loculis cylindricis, 18-20 X 6-7/*. 



