Dothideomycetes » Phaeothecoidiellaceae

Rivilata

Rivilata Kohlm., Volkm.-Kohlm. & O.E. Erikss., Can. J. Bot. 76(3): 470 (1998).

Index Fungorum number: IF 27932; Facesoffungi number: FoF 07643, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on leaves. Sexual morph: Thyriothecia pulvinate, flattened or slightly convex on top, dark brown when wet, appearing black when dry, anchored with short hyaline hyphae in the epidermal cells of the host, hymenium covered by an epithecium, developing under the cuticle, which eventually peels off, becoming superficial, single or in small groups. Epithecium composed of short dark brown hyphoid cells; opening by irregular slits when moistened and exposing the hymenium. Hamathecium comprising pseudoparenchymatous tissue of hyaline stromatal cells surrounding the asci. Asci 8-spored, bitunicate, clavate, upper part ellipsoidal to obovate, short pedicellate, thick at the apex, dehiscence rostrate, without an apical apparatus, with oculus. Ascospores irregularly arranged in the ascus, ellipsoidal, uniseptate, slightly constricted at the septum, upper cell wider than the lower one, smooth-walled, hyaline, full of oil droplets. Asexual morph: Unknown (adapted from Doilom et al. 2018).

 Type species: Rivilata ius Kohlm., Volkm.-Kohlm. & O.E. Erikss

Notes: Rivilata is characterised by pulvinate, flattened or slightly convex thyriothecia, bitunicate, clavate, ellipsoidal to obovate, short pedicellate asci, and ellipsoidal, uniseptate ascospores. Rivilata resembles members of the Saccardiaceae (syn. Phillipsiellaceae) in having pulvinate ascomata, ellipsoidal to obovate asci and saprobic lifestyle, occurring on the cuticle of leaves or other plant parts. Lumbsch and Huhndorf (2010) and Wijayawardene et al. (2018) placed Rivilata in Saccardiaceae. Doilom et al. (2018) re-examined the holotype specimen of Rivilata ius and transferred it to Phaeothecoidiellaceae based on its morphological similarity to Translucidithyrium. Rivilata is a distinct genus in Phaeothecoidiellaceae but molecular data is needed to confirm this placement.

 

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