Bactrodesmium abruptum (Berk. & Broome) E.W. Mason & S. Hughes, in Hughes, Can. J. Bot. 36: 738 (1958) Fig. 32
≡ Sporidesmium abruptum Berk. & Broome, Ann. Mag. nat. Hist., Ser. 3 15: 401 (1865)
Index Fungorum number: IF 162285; Facesoffungi number: FoF 06216
Pathogenic on dead wood. Sexual morph: Undetermined. Asexual morph: Sporodochia 216–276 μm diam., scattered, punctiform, dark-brown. Conidiophores 13–20 µm × 4–6 µm (x̅ = 17 × 5 µm, n = 20), macronematous, mononematous, packed together closely to form pulvinate sporodochia, unbranched, mid to dark-brown, smooth, septate. Conidiogenous cells integrated, holoblastic, monoblastic, terminal, cylindrical. Conidia 42–66 µm × 11–19 µm (x̅ = 51 × 16 µm, n = 20), oblong-clavate, confluent with the stem, 4–6-septate, the lower articulation and the uppermost short, the second from the top very long, solitary, straight to curved, rounded at the tip and truncate at the base, the upper end becoming progressively paler towards the basal cell which is usually sub-hyaline, with a very dark band at the first septum from the top, smooth.
Material examined – UK, on dead wood, March 1964, Bloxam, (IMI 6833, holotype).
Economic significance – The genus Bactrodesmium is associated with degradation of rubber wood logs and leaf litter (Seephueak 2012). The genus can also infect living hosts such as white spruce (Picea), Betula species and others reducing the economic value of plants (Bagdžiūnaitė 2006). The genus Bactrodesmium has also been isolated from apple green leaves or dead leaves as pathogens (Bernier 1996).