PYEENULACEAE. 527 



On bark of Jacquinia keyensis, vicinity of The Bight, Cat Island (Britton and 

 Millspwufjh, March 1-6, 1907, 58.',0, type). 



The white epiphloeodal thallus and the shining glohose perithecia will serve to 

 distinguish this from the few species of Microthelia having four-celled spores, such 

 as M. thelena var. suhtriseptata Wainio. 



6. CLATHROPORINA Muell. Arg. 



1. Clathroporina nuculastnim Muell. Arg. Flora 67: 618. 1884, 



On twigs. New Providence, at Maidenhead Coppice : — Florida ; Madagascar. 



7. POLYBLASTldPSIS Zahlbr. 



1. Polyblastiopsis lactea (Mass.) Zahlbr. in Eiigler and Prantl, Nat. Pflan- 

 zenfam. T*: 65. 1903. 



Blastodesmia lactea Mass. apud Koerb. Parerg. Lich. 336. 1865. 



On bark, New Providence and The Bight, Cat Island : — North America ; Europe. 



8. ANTHRACOTHECIUM Mass. 



Thallus from orange to yellow, 1. A. ochraceo-ffavum. 



Thallus from white to olivaceous. 



Spores with two to four series of cells. 



Spores with two series of cells. 2. A. subglohosum. 



Spores with four series of cells. 3. A. corticatum. 



Spores with six to eight series of cells. 



Perithecia immersed except when old. 4. A. libricolum. 



Perithecium soon emergent and superficial. 5. A. americanum. 



1. Anthracothecium ochraceo-flavum (Nyl.) Muell. Arg. Linnaea 43: 44. 1880. 



V errucaria ochraceo-flavum Nyl. Expos. Pyren. 50. 1858. 

 Verrucaria ocTiraceo-flavens Nyl. Act. Soc. Sci. Fenn. 7: 491. 1863. 



On bark of various species, Great Bahama, New Providence, Cave Cay, Exuma 

 Chain, Cat Island : — widely distributed in tropical regions of both hemispheres. 



2. Anthracothecium subglobosum Eiddle, sp. nov. 



Thallus epiphloeodes erustaoeus uniformis effusus baud limitatus, sordide 

 aut vireseenti-albidus, in crassitudine mediocris vel tenuis, rimosus rugulosus. 

 Gonidia chroolepoidea. Perithecia dispersa solitaria, primum immersa, verrucis 

 thallinis convexis, apice plus minusve nudato minute umbilicato, dein circa % 

 ad Ys emergentia, globosa, 0.7-1.0 mm. diam., nigra Integra. Paraphyses sim- 

 plices crassiusculae. Asci cylindrices 8-spori. Sporae in ascis uniseriales, 

 fumosae aut fuseo-atrae, globosae circa 12 /* diam.^ aut subglobosae circa 

 12 X 10 M, primum biloculares mox loculis altero ambobusve divisis rotundatis. 



On bark, New Providence (Brace, February 11, 1919, 1006^, type). 



The specific name refers not to the perithecia but to the peculiar spores. The 

 species is related to A. sinapispermum (Fee) Muell. Arg., but the latter species has 

 minute perithecia, 0.15-0.2 mm. in diameter, and oblong spores, 7-8 x 4-5 w 



3. Anthracothecium corticatum Muell. Arg. Bull. Soc. Roy. Bot. Belg. 30^: 



96. 1891. 

 On bark. New Providence, at Waterloo Coppice : — Costa Rica, Venezuela. 



4. Anthracothecium libricolum (Fee) Muell. Arg. Linnaea 43: 43. 1880. 



Pyrenula lihricola Fee, Suppl. Essai Crypt. 82, pi. 41, f. 31. 1837. 



On bark of various species. Great Bahama, New Providence, Great Exuma, Long 

 Island : — widely distributed in tropical and subtropical regions of both hemispheres. 



This species is a common and variable one. All stages may be found from that 

 in which the perithecia are completely buried in the thallus and scarcely discernible 

 externally, to that in which the perithecia become half emergent, when they are con- 

 spicuous and appear relatively large. Superficially the two extremes look very 

 different. 



