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Barrasa, José María, Víctor J. Rico & Manuel Villarreal. Arrhenia eburnea sp. nov. from Spain. Mycotaxon 88: 113 - 118. 2003.

ABSTRACT: Arrhenia eburnea, an omphalinoid fibulate fungus, is described as a new species. It is characterized by pale basidiomata (white, ivory to yellowish-white), deeply decurrent lamellae, membranal and incrusting pigment of the pileipellis and shape and size of spores. The most similar in outward appearance and macroscopic morphology is the blue-green species Arrhenia chlorocyanea, but the new taxon clearly differs from it in the colour of the basidiomata, type of pigment of the pileipellis and spore size. It is also similar in colour to Omphalina luteopallida but differs from it in habit, glabrous stipe and tetrasporic basidia. The inclusion of species with pale basidiomata (white, ivory, yellowish-white to ochraceous-white) in the concept of the genus Arrhenia is discussed and the new combination Arrhenia luteopallida is also proposed.

KEYWORDS: Tricholomataceae, Agaricales, Basidiomycota, taxonomy

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