Three distinctive neotropical species of Hypoxylon (Xylariaceae) with purple KOH-extractable pigments, including two new taxa H. cypraeisporum sp. nov. and H. sclerophaeum var. parvisporum var. nov.
By Fournier J., Lechat C.

Vol. 7 (1) – 10 February 2015

doi: 10.25664/art-0122

 Open Access

 

Abstract: Three species of Hypoxylon collected in the French West Indies that release violaceous to purple KOH-extractable pigments are described and compared with their known relatives. Two of them exhibit a combination of morphological characters that supports their status of new taxa as H. cypraeisporum and H. sclerophaeum var. parvisporum. The former is diagnosed by black rosellinioid stromata and ascospores with conspicuously pitted epispore and the latter by its ascospores significantly smaller than in the typical variety. Two ancient herbarium specimens of H. sclerophaeum have been studied for comparison and are illustrated. The third species dealt with, occurring on bamboo, appeared conspecific with H. rugulosporum, a species known from Papua New Guinea, based on examination of the isotype and reinterpretation of some of its morphological characters. Hypoxylon rugulosporum is recorded here for the first time from the Neotropics. An updated dichotomous key to the Hypoxylon spp. with purple KOH-extractable pigments is provided


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