Dothideomycetes » Dothideomycetes, genera incertae sedis


Bryostroma Döbbeler, Mitt. bot. StSamml., Münch. 14: 170 (1978).

Index Fungorum number: IF 673; Facesoffungi number: FoF 12141, 13 morphological species (Species Fungorum 2022), no molecular data available.

Parasitic on host. Sexual morph: Fruit bodies subglobose, black, glabrous, solitary, superficial to slightly immersed in the host tissue. Ostiole round, not protruding. Peridium surface layer comprising thick-walled, angular dark brown cells, darker at the top than towards the base, outer cells mostly isodiametric, discontinuous giving the fruiting body a cracked appearance. Interascal filaments septate, fairly thick-walled, anastomosing, mostly fragmented or deliquescing at maturity, probably attached at both ends to the interior of the fruiting body. Asci variable in length depending on the number of spores, cylindric-clavate, often with a short, narrowed foot, the apex rounded, thick-walled and fissitunicate with the internal layer staining orange in Lugol’s solution, with a short broad ocular chamber, not bluing in iodine, 2-, 4-, 6- or 8-spored with abortive spores sometimes present. Ascospores arranged obliquely uniseriately or biseriately, ellipsoidal, fusiform-ellipsoidal or narrowly clavate, distinctly constricted at the ± median septum and with rare secondary septum development, hyaline, the upper cell slightly broader and more cylindrical than the lower cell, the apex obtuse and the base acute to obtuse, straight to slightly bent, single central guttules present in developing spores but later dividing into many (12+) small ones in mature spores, the wall minutely rugulose, mucilaginous sheath absent. Vegetative hyphae variable, hyaline to pale brown, intracellular in the stem of the host, polymorphic, thin-walled, branched, forming a small stromatic wedge beneath the fruit bodies that penetrates a short way into the host tissues. Appressoria absent. Asexual morph: Unknown (adapted from Greiff and Cannon 2020).


Type species: Bryostroma racomitrii Döbbeler


Notes: Bryostroma was introduced by Döbbeler (1978) with B. racomitrii as type species. Bryostroma is characterised by subglobose, black, glabrous, solitary fruiting bodies, septate, fairly thick-walled interascal filaments, cylindric-clavate asci and ellipsoidal, fusiform-ellipsoidal or narrowly clavate ascospores. The generic description of Bryostroma is not available. We adapted the description from the updated account of Bryostroma popei found from British Isles (Greiff and Cannon 2020). Molecular data is lacking for Bryostroma. Fresh collections with DNA sequence data are needed to determine the phylogenetic position of Bryostroma.


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