Pleoanamorphy with two types of conidia is reported for the first time in Gyrothrix verticiclada. The first conidial type has the normal morphology already known for G. verticiclada, but the second conidial type is identified here as an Idriella-like synanamorph. Both conidial types were isolated, then cultivated separately, photographed, and deposited in the Mycothèque de l'Université Catholique de Louvain (BCCM™/MUCL). The morphological similarities of both types of conidia were examined in comparison with conidia in other species of Idriella and Gyrothrix guided by a phylogenetic analysis of DNA sequences from three gene regions and morphological data. Phylogenetic analyses were performed with maximum parsimony as the optimality criterion using the program TNT. Results indicated that one individual of Gyrothrix verticiclada is associated with Idriella cubensis and seven with species of both genera. Both types of conidia, Gyrothrix verticiclada (MUCL54065) and the Idriella-like synanamorph (MUCL54064) were recovered as homologous. In addition to knowledge about pleomorphism of G. verticiclada, a BLAST search was made using ITS and LSU sequences in order to find the teleomorphic relationship of G. verticiclada. The teleomorphic connection suggests a correspondence with named genera belonging to the order Xylariales.
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Vol. 37 • No. 2