Dothideomycetes » Dothideomycetes, genera incertae sedis

Harknessiella

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

 

Harknessiella Sacc., Syll. fung. (Abellini) 8: 845 (1889)

Saprobic on lower surface of leaves. Sexual morph: Ascomata scattered, solitary, superficial, and globose to subglobose, easily removable from the host surface, with setae, glabrous, ostiolate at centre, with minute papilla internally lined with short, brown, aseptate periphyses. Peridium thin-walled, of equal thickness, composed of several layers of small, flattened, brown to dark brown cells of textura angularis. Hamathecium composed of dense, broad filamentous, distinctly septate, anastomosed pseudoparaphyses, trabeculate, embedded in a hyaline gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, fusiform to ellipsoidal, cylindrical to cylindric-clavate, short pedicellate, apically rounded, with an ocular chamber. Ascospores overlapping 1–2-seriate, hyaline, with rounded ends, 3-septate, slightly constricted at the central septum, smooth-walled. Asexual morph: Pycnidia hypophyllous, dark brown to black, superficial, sparsely scattered or sporadically distributed on surface of leaves, easily removable from the host substrate. Conidiophores straight or slightly curved, hyaline, reduced to conidiogenous cells. Conidiogenous cells holoblastic, percurrent, cylindrical to elliptical, septate, rough and thick-walled. Conidia 2–3 septate, ellipsoidal to cylindrical, hyaline to olivaceous-green, smooth-walled.

 

Type species – Harknessiella purpurea (W. Phillips & Harkn.) Sacc.

 

Notes – The genus Harknessiella was introduced by Saccardo (1889) with Harknessiella purpurea as the type species. The latter was also found on lower surface of leaves of Garrya elliptica. The genus is characterized by globose to subglobose, superficial ascomata, consisting of dark-brown setae, cylindrical to cylindric-clavate asci and fusiform to ellipsoidal ascospores. We re-examined a specimen of Harknessiella purpurea under the code C0170081F from F herbarium. It seems that the genus Harknessiella shares similar characters with the genus Aphanostigme in Phaeosphaeriaceae (Boonmee et al. 2017). However, we retain the genus Harknessiella to Dothideomycetes, genera incertae sedis until fresh collections are available for further molecular studies.

 

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