Dothideomycetes » Dothideomycetes, genera incertae sedis

Linopeltis

Citation: Pem D et al. (2019) Mycosphere Notes 275-324: A morphotaxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10(1), 1115–1246

 

Linopeltis I. Hino & Katum., Bull. Faculty of Agriculture, Yamaguchi University 11: 15 (1960)

Epiphytic or saprobic on culms of Sinobambusa tootsik. Sexual morph: Ascostromata scattered, solitary to gregarious, subcuticular or superficial, with hyphae immersed under host tissue, elongate ellipsoidal or irregular in shape, dark brown to black, hemispherical, shiny, glabrous, multi-loculate, with slit-like opening. Locules clustered, globose to subglobose. Peridium composed of a single layer of isodiametric cells, thin-walled, dark brown to black with the base comprising of pseudoparenchymatous cells, arranged in a textura epidermoidea. Hamathecium numerous, filiform, aseptate, broad pseudoparaphyses, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, oblong to ellipsoidal, short pedicellate, apically rounded, with indistinct ocular chamber. Ascospores overlapping, fasciculate, firstly hyaline, becoming brown at maturity, cylindrical to elongated fusoid, with marginally rounded ends, distoseptate, 6–10-septate, thick and smooth-walled. Asexual morph: Undetermined.

 

Type species – Linopeltis ryukyuensis I. Hino & Katum.

 

Notes The genus Linopeltis was introduced by Hino & Katumoto (1961) with Linopeltis ryukyuensis as the type species. The main characters of the genus are hysterothecial-like ascomata with slit-like openings, oblong to ellipsoidal asci and elongated fusiform to cylindrical, distoseptate ascospores (Phookamsak et al. 2016). The genus was previously placed in Schizothyriaceae by many authors (Von Arx & Müller 1975, Kirk et al. 2008, Lumbsch & Huhndorf 2010, Hyde et al. 2013, Wijayawardene et al. 2014). Linopeltis was compared to the genera in Asterinaceae and Aulographaceae in having elongated hysterothecial-like ascomata with slit-like openings (Hyde et al. 2013, Hongsanan et al. 2014, Phookamsak et al. 2016). We examined the holotype specimen of Linopeltis ryukyuensis from YAM herbarium under the code YAM 20332. Linopeltis shares similar morphological similarities to the genus Leptopeltis in having subcuticular or superficial ascostromata, hamathecium comprising numerous broad pseudoparaphyses, bitunicate, cylindrical to cylindric clavate, 8-spored asci. However, the ascospores of the genus Linopeltis are distoseptate, 6–10-septate while that of Leptopeltis is 0–3-septate. We retain the genus Linopeltis in Dothideomycetes, genera incertae sedis until fresh collection and molecular data becomes available.

 

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