Dothideomycetes families incertae sedis » Pododimeriaceae

Chaetoscutula

Chaetoscutula E. Müll., Sydowia 12(1–6): 190 (1959) [1958].

Index Fungorum number: IF 967; Facesoffungi number: FoF 07898, 1 morphological species (Species Fungorum 2022), no molecular data available.

Parasitic or saprobic on leaves of Juniperus sabina. Sexual morph: Ascomata solitary, scattered, superficial on the leaves and easily removed, globose to subglobose, black, sometimes with long and brown setae. Ostiole inconspicuous. Peridium thick at the base, thinner at the apex, 1-layered, composed of small, brown, thick-walled cells of textura angularis. Hamathecium composed of 2–3 µm broad, transversely septate, long, branched or simple, cellular, hypha-like pseudoparaphyses, encircling the asci and embedded in a gelatinous matrix. Asci 8-spored, bitunicate, cylindrical to broadly clavate or ellipsoid, short pedicellate, without a conspicuous ocular chamber. Ascospores biseriate, ellipsoid to fusiform, uniseptate, constricted at the septum, with dark septum, rounded at both ends, with wider cell and lower narrow and longer cell, hyaline, later turning brown on senescence, 2-walled, with outer thick and smooth wall, guttulate. Asexual morph: Unknown (adapted from Tian et al. 2014).

 Type species: Chaetoscutula juniperi E. Müll.

Notes: Chaetoscutula is characterised by globose to subglobose, black ascomata, biseriate, cylindrical to broadly clavate or ellipsoid, short pedicellate asci and ellipsoid to fusiform, uniseptate ascospores. Lumbsch and Huhndorf (2010) placed Chaetoscutula as family incertae sedis. Chaetoscutula resembles Pododimeria in Pseudoperisporiaceae in having superficial ascomata, with or without setae anduniseptate, olivaceous-brown ascospores and both genera occur on Juniperus sp. Tian et al. (2014), re-examined the authentic specimen of C. juniperi and transferred Chaetoscutula to Pseudoperisporiaceae based mainly on broadly clavate asci anduniseptate ascospores with rounded ends. Boonmee et al. (2017) revised the genera in Pseudoperisporiaceae and transferred Chaetoscutula to Pododimeriaceae based on the hosts and features of asci and ascospores. Chaetoscutula is morphologically a distinct genus in Pododimeriaceae but fresh collections and molecular data are required to confirm this taxonomic placement.

 

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