Planistroma
Planistroma A.W. Ramaley, Mycotaxon 42: 69 (1991).
Index Fungorum number: IF 25358; Facesoffungi number: FoF06264; 7 morphological species (Monkai et al. 2013; Species Fungorum 2022), 6 species with molecular data.
Biotrophic or saprotrophic on leaves and stems. Sexual morph: Ascostromata subepidermal, immersed, partially erumpent remaining at the rim covered by epidermis, solitary to gregarious, multilocular, hemispherical, dark brown to black, thick-walled. Cells of ascostromata at the side composed of several layers of dark brown columns of elongate cells, reaching from the base to the top, at the base composed of several layers of dark brown cells, textura angularis. Locules ovoid to globose, developing in the same stroma of the conidiogenous and/or spermatogenous locules, collapsing with the empty locule which previously producing conidia or spermatia or both, periphysate ostiole. Peridium of locules composed of a few layers of hyaline to light brown flattened cells. Hamathecium lacking pseudoparaphyses when mature, filamentous, cylindrical or irregularly curved interascal cells which are swollen at the ends. Asci 8-spored, bitunicate, fissitunicate, cylindrical, with a long fan-shaped pedicel and with an ocular chamber. Ascospores overlapping 1−2-seriate, ellipsoid, hyaline, aseptate, many guttules, rough, sometimes surrounded by a slime layer. Asexual morph: Stromata subepidermal, black, immersed, erumpent by remaining at the rim cover by epidermis, solitary to gregarious, hemispherical, multilocular. Stromata wall composed of dark brown, thick-walled cells of textura angularis, lighter pale coloured toward the interior, the top layers of the stromata composed of columns of elongated cells, extending from the base and the sides to the top surface of the stromata. Conidiophores absent. Microconidiogenous cells form on the wall-layer of locules, short-cylindric, hyaline, smooth, and each forming acrogenous holoblastic conidium. Macroconidia fusiform, curved or bent, tapering toward the apex or the base, base truncate, mostly aseptate, smooth, hyaline. Microconidia cylindric, irregularly swelled or bent, aseptate, smooth-walled, hyaline. Spermatia formed on a part of walls of a macroconidiogenous locule or in one or more separate locules in a stroma. Spermatogenous cells phialidic, cylindric to elongate-conical, discrete or integrated on one-celled conidiophores, determinate, hyaline, smooth, forming acrogenous spermatia. Spermatia bacillary, hyaline, aseptate, smooth (asexual morph description follows Ramaley 1991).
Type species: Planistroma yuccigenum A.W. Ramaley.
Notes: Planistroma resembles Kellermania in having similar ascostromatal characters but differs in having aseptate ascospores. The asexual morph of Planistroma differs from Kellermania in lacking septa and appendages in the conidia (Ramaley 1995). Planistroma was synonymized under Kellermania based on molecular data (Minnis et al. 2012). Monkai et al. (2013) considered Planistroma as a distinct genus in Planistromellaceae based on both morphological and molecular data. Molecular markers available for Planistroma are ITS and LSU.
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