1 84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Sporae incolores simplices ellipsoideae aut oblongae, 44-60 x 21-28 (i, 

 membrana crassiuscula laevigata. 



Thallus crustose, uniform, widespread, continuous, smooth or becom- 

 ing partly rough, light j^ellow; perithecia small, 0.3-0.6 mm. across, di- 

 midiate, above hemispherical convex, parth'^ superficial, the ostiole minute, 

 terminal; colored like the thallus; paraphyses persistent, netlike inter- 

 woven; asci cylindrical; spores 6-8, hyaline, nonseptate, ellipsoid or ob- 

 long, 44-60 X 21-28 ft, with thick smooth wall. 



On tree bark. Port Parker, Costa Rica, March 24, 1939, Wm. R. 

 Taylor, 39-718. Type deposited in the herbaria of the Allan Hancock 

 Foundation and of the University of Michigan. M. lutescens can be dis- 

 tinguished from M. palmicola Riddle, which has a white thallus, asci with 

 2-4 spores, and spores 30-50 x 16-20 /a. 



Anthracothecium canellae-albae (Fee) Miill. Arg. — On bark of trees, 

 Port Parker, Costa Rica, March 24, 1939, Taylor, 39-717. 



TRYPETHELIACEAE 



Trypethclium aeneuin (Eschw.) Zahlbr. — On tree branches, Choca- 

 hua Bay, coast of Mexico, March 21, 1939, Taylor, 39-715; on bark of 

 trees, Islas Secas, Panama, March 27, 1939, Taylor, 39-728. 



ARTHONIAGEAE 



Arthothelium spectabile Mass. — On bark of trees. Port Parker, Costa 

 Rica, March 24, 1939, Taylor, 39-720. 



Arthothelium macrothecum (Fee) Mass. — On bark of trees. Port 

 Parker, Costa Rica, March 24, 1939, Taylor, 39-721. 



GRAPHIDAGEAE 



Graphis scripta (L.) Ach. — On bark of trees, Port Parker, Costa 

 Rica, March 24, 1939, Taylor, 39-719. 



CHIODEGTONAGEAE 



Minksia saxicola n. sp. — Thallus crustaceus, uniformis, pallido aut 

 laeviter glaucescens, hypothallo indistincto. Apothecia thallo immersa, ag- 

 gregata, vulgo rotundata aut elongata, disco nigro, 0.05-0.1 mm. lato. 

 Paraphyses ramosae. Asci clavati, 96 x 32 /i, 4-8-spori. Sporae incolores, 

 oblongae, murales, 33-40 x 9-15 fi, 9-11 transverse septate et 1-2 longi- 

 tudinale septatae, cellulis cubicis. 



