The genus Xylaria sensu lato (Xylariaceae) in Guadeloupe and Martinique (French West Indies) III. Taxa with slender upright stromata
By Fournier J., Lechat C., Courtecuisse R.

Vol. 12 (3) – 15 June 2020

doi: 10.25664/art-0302

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Abstract: Thirty-five taxa of Xylaria collected in Guadeloupe and Martinique, featuring upright slender stromata less than 5 mm wide, are documented and commented in this paper which comes in the continuation of two previous papers on penzigioid taxa (part I) and upright robust taxa (part II). Based on the evaluation and comparison of their morphological characters, twenty-two previously known taxa were identified, including X. adscendens, X. arbuscula, X. arbuscula var. plenofissura, X. aristata, X. badia, X. bambusicola, X. coccophora, X. curta, X. feejeensis, X. fimbriata, X. fissilis, X. ianthinovelutina, X. microceras, X. multiplex, X. multiplex var. microsperma, X. muscandae, X. muscula, X. phyllocharis, X. rickii, X. schwackei, X. scruposa and X. vivantii. The following five taxa are described as new, viz.: X. friabilis, X. martinicensis, X. martinicensis var. microspora, X. pallidocylindracea and X. vinosa. In addition, we present five further collections that could not be identified and likely correspond to potentially new taxa (X. sp. CLL 5110, X. sp. CLL 5241-2, X. sp. CLL 5534, X. sp. CLLGUAD 029 and X. sp. MJF 14123) but are represented by insufficient material to be formally described; two other collections are provisionally referred to X. gracillima and X. oligotoma, two species having been variously interpreted in the past and whose ill-defined taxonomic concepts preclude a reliable identification; finally, a group of seven collections appearing closely related but showing a disturbing morphological and phylogenetical heterogeneousness are tentatively referred to X. longiana. A dichotomous identification key and synoptic figure plates of stromatal surface are presented. In conclusion, a table summarizing the cumulated number of collections of each taxon dealt with in the three parts is provided

This paper is the last in a series of three dedicated to the survey of Xylaria spp. collected in Guadeloupe and Martinique during an inventorial program initiated in 2003 in these Caribbean islands (Courtecuisse, 2006). It comes after similar surveys of penzigioid taxa […]