SOME LICHENS FROM THE AMERICAN TROPICS 

 COLLECTED BY WM. R. TAYLOR* 



Joyce Hedrick 



The specimens upon which this report is based were collected by Wm. 

 R. Taylor, botanist with the Allan Hancock Expedition of 1939. Lichens 

 were obtained at stops made off the west coast of Mexico, on Clarion and 

 Socorro islands ; along the west coast of Costa Rica, at Port Parker near 

 Salinas Bay and at Golfo Dulce; along the west coast of Panama, at 

 Bahia Honda, and the south coast at Islas Secas near Puerto Neuvo ; and 

 at the western end of Tortuga Island in the Caribbean Sea north of 

 Venezuela. 



There has been little published on the lichens from these specific re- 

 gions. The Flora of Costa Rica by Durand and Pittier in 1891-96 gives 

 two lists of lichens prepared by J. Miiller. The first enumerates 214 

 species and the second 281. Part I, Foliose and Fruticose Lichens of Costa 

 Rica, by Dodge appeared in 1933 with discussions of 73 species and vari- 

 eties. Lichens collected on the Galapagos Islands by Snodgrass and Heller 

 were reported by Robinson in 1902. Stewart in 1912 published Notes on 

 the Lichens of Galapagos Islands. Linder in 1932 presented the lichens 

 of the Templeton Crocker Expedition of the California Academy of 

 Sciences, 1932, mainly from Guadalupe Island, Lower California, and 

 other islands off the west coast of Mexico. In 1936 Dodge reported on 

 the lichens of the Allan Hancock Expedition of 1934. Svenson in 1935 

 listed the lichens of the Astor Expedition of 1930. 



In the present account 23 species in 15 genera are listed. Two species, 

 Monoblastia lutescens and Minksia saxicola, are described as new. Seven 

 other species in the list are not found in the papers mentioned above. 



PYRENULAGEAE 



Monoblastia lutescens n. sp. Thallus crustaceus uniformis effusus 

 baud limitatus, continuus laevigatus aut parte inaequalis, laeviter lutes- 

 cens. Perithecia circ. 0.3-0.6 mm. lata, dimidiata alte hemisphaerico- 

 convexa, parte superficialia, ostiolo minute umbilicato concolore thallo. 

 Paraphyses persistentes ramoso-convexae. Asci cylind rices, 6-8-spori. 



* Papers from the Herbarium of the University of Michigan. 



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