BRITTON: FLORA OF THE VIRGIN ISLANDS 115 



4. Arthonia. On bark, Bordeaux, 577. 



5. Arthothelium macrothecum (Fee) Mass. On Icacorea, Bor- 



deaux, 540. 



6. Graphina nitidescens (Nyl.) Riddle comb. nov. 



Fissurina Nyl. Lich. Japon. 108. 1890. 



On Nectandra, Bordeaux, 581. Florida, Cuba, Porto Rico. 



7. Opegrapha vulgata Ach. On Maytenus, Little St. James Island, 



N. L. Britton & J. N. Rose, 1405. 



8. Leptogium marginellum var. isidiosellum Riddle var. nov. 



Thallus isidiis tenuibus dense tectus; ceterus ut in forma typica apothecia 

 nulla. 



On wet rock, road to Rosenberg, N. L. Britton & J. A. Shafer, 

 Feb. 5-7, 1913, no. 276 (type!). 



The fringed apothecia being such a characteristic feature of 

 Leptogium marginellum, it is only after some hesitation that this 

 material has been placed here. The texture and the wrinkling of the 

 thallus is in exact agreement, however, with typical specimens. And 

 the relation of this variety to the species is strictly comparable with 

 the conditions in L. tremelloides, abundantly fruiting in the tropics, 

 and its variety caesium, with isidia but very rarely fruiting; and with 

 L. phyllocarpum and its variety isidiosellum. 



9. Parmelia tinctorum Despr. On tree-trunk, Bordeaux, 567. 



The following lichens are recorded in "Le Vegetation des Antilles 

 Danoises" by F. B0rgesen & Ove Paulsen in Revue Generale de 

 Botanique 12: 507, 508. 1900, 



Sticta Weigelii (Ach.) Wainio. St. Croix; St. Thomas. 

 Graphis scripta (L.) Ach. St. Croix. 

 Lecidea buelliana Muell. Arg. St. Croix. 

 Pertusaria Wulfenii (DC.) Fr. St. Croix. 

 Parmelia perlata (L.) Ach. St. Thomas; St. Jan. 

 Parmelia tinctorum Despr. [P. coralloides Mey. et Flot.] St. Croix. 

 Physcia integrata Nyl. St. Jan. 

 RixoDiNA sp. St. Croix. 

 Verrucaria sp. St. Croix. 

 Arthonia radiata (Pers.) Ach. St. Croix. 

 ScHizoxYLON sp. St. Thomas. 



Fungi 



During our exploration of St. Thomas and St. Jan in 1913, about 

 25 species of fungi were obtained, and Dr. Rose collected four others 

 on St. Croix; manuscript record has been made of these. 



Twenty species collected by Mr. Ricksecker on St. Croix are 



