Pyrenomycetes Species Page

Bertia moriformis

Small separate ascomata
didymospore
(Tode) De Not., G. bot. ital. 1(1(5-6)): 335 (1844)
Sphaeria moriformis Tode
Hypocreomycetidae
Coronophorales
Figure from SMH2023 (Puerto Rico); ANM264 (USA, GSMNP)
Complete Description
Ascomata ovoid to cylindrical to vertically elongate, with a thick sterile base, sometimes collapsing laterally when dry, dark brown to black, 400-700 µm diam., 500-1000 µm high, superficial, with a roughened, tuberculate surface, occurring in small to large clusters. Ascomatal wall of textura globosa in surface view; in longitudinal section a single layer, composed of pale brown, pseudoparenchymatic cells, with smaller cells at the outer surface, cells at base radiate from the bottom; Munk pores present, few per cell. Ascomatal apex rounded, external ostiole indistinct but visible in longitudinal section, periphyses absent. Centrum with a apical cushion of hyaline, thin-walled cells, quellkorper absent, paraphyses hyaline, widely inflated, unbranched. Asci cylindrical-clavate, long-stipitate, spore bearing part 80-95 µm, pedicels 85-120 µm, with an indistinct apical ring, with 8 biseriate ascospores. Ascospores fusiform, hyaline, 1-(3) septate, 35-50 x 4-6.5 µm, without sheath or appendages.
Occurrence
Found on decaying wood. Our only tropical specimen is from Puerto Rico. In the literature it is reported predominantly from temperate areas, known from Europe and North America. It is probably the most commonly encountered pyrenomycete in the Great Smoky Mountains National Park, where it occurs throughout the year on hard, freshly decorticated branches and logs.
Similar Taxa Comments
This is mostly a temperate species and rarely found in the tropics. It is included as a comparison for other species of Bertia that are more common in the tropics. The ascomata can be separate or clustered and often are strongly warted as shown in the ANM264 specimen below. The ascomata can be collabent but more often (and in most temperate specimens) they collapse laterally, a feature distinguishing this species from B. tropicalis. The long fusiform ascospores are mostly one-septate but can sometimes appear three septate. The ascospores remain hyaline differing from those of B. multiseptata that turn brown. The ascus stipe in the SMH2023 collection is longer than that reported in the literature.
Reference
Cortlett and Krug 1984.