PYRENULACEAE. 527 



„■„ ^"^ ^?-^^ °* Jacqulnia keyensia, vicinity of The Bight, Cat Island (Britton and 

 MtlUpcmgK; March 1-6, 1907, 58^0, type). 



The white eplphloeodal thallus and the shining globose perithecia will serve to 

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

 as M. thelena var. subtriaeptata Wainio. 



6. CLATHBOPOEmA Muell. Arg. 



1. Olathroporina nuculastrum Muell. Arg. Flora 67: 618. 1884. 



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



7. POLYBLASTldpSIS Zahlbr. 



1. Polyblastiopsis Idctea (Mass.) ZaMbr. in Erigler and Prantl, Nat. Pflan- 

 zenfam. 1'*: 65. 1903. 



Blastodesmia lactea Mass. apud Koerb. Parerg. Lich. 336. 18651 



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



8. AU-THBAOOTHECIUM Mass. 



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



Thallus from white to olivaceous. 



Spores with two to four series of cells. 



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



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



Spores with six to eight series of cells. 



Perithecia immersed except when old. 4. A..UJ>Hcolum, 



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



1. Anthracothecium ocliraceo-flavum (Nyl.) MueU. Arg. Linnaea 43: 44. 1880. 



Verrucaria ochraceo-flavum Nyl. Expos. Pyren. 50. 1858. 

 Verrucaria ochraceo-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 Riddle, sp. nov. 



Thallus epipUoeodes crustaceus uniformis effusus haud limitatus, sordide 

 aut virescenti-albidus, in crassitudine medioeris vel tenuis, rimosus rugulosus. 

 Gonidia chroolepoidea. Perithecia dispersa solitaria, primum immersa, verrucis 

 thaUinis convexis, apioe plus minusve nudato minute umbilicato, dein cirea ^ 

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

 pliees erassiusculae. Asci cylindrices 8-spori. Sporae in ascis uniseriales, 

 iumosae aut fusco-atrae, globosae circa 12 fi diam.j aut subglobosae circa 

 12 X 10 |U, primum biloculares mox loeulis altero ambobusve divisis rotundatis. 



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



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

 species is related to A. ainapiapermum (Ffie) Muell. Arg., but the latter species has 

 minute perithecia, 0.15-0.2 mm. in diameter, and oblong spores, 7-8x4-5(4. 



3. Anthracothecium corticatum Muell. Arg. Bull. Soc. Eoy. Bot. Belg. 30*: 



96. 1891. 

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



4. Anthracothecium Ubrlcolum (F6e) Muell. Arg. Linnaea 43: 43. 1880. 



Pyrenula libricola F6e, 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. AH stages may be found from that 

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

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

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

 different. 



