Fungalpedia – Note 37 Rostrohypoxylon
Rostrohypoxylon J. Fourn. & M. Stadler
Citation if using this entry: Fallahi et al. (2023) New genera in 2010-2011. Mycosphere (in prep)
Fournier et al. (2010) introduced Rostrohypoxylon as a monotypic genus with the type species Rostrohypoxylon terebratum J. Fourn. & M. Stadler in Hypoxylaceae (Xylariales). Rostrohypoxylon terebratum was found on the dead bark of Lithocarpus from northern Thailand (Fournier et al. 2010). The species is distinguished by its strongly protruding ostiolar necks, erumpent effuse stromata, and KOH extractable pigments (Fournier et al. 2010). It forms unitunicate, cylindrical, eight-spored, and fragile asci. Ascospores are brown, one-celled, cylindrical, and have faint straight germ slits. Rostrohypoxylon shares high morphological similarity with Annulohypoxylon, within Hypoxylaceae. According to the phylogenetic analysis (based on ITS, LSU, RPB2, and β-tubulin), and chemotaxonomic data, Rostrohypoxylon terebratum showed a strong connection with Annulohypoxylon species (Daranagama et al. 2018). However, the comparison of stromal HPLC profiles revealed unknown compounds that did not correspond with those of Annulohypoxylon. Subsequently, Rostrohypoxylon was considered a distinct genus from Annulohypoxylon (Fournier et al. 2010; Daranagama et al. 2018).
Type species: Rostrohypoxylon terebratum J. Fourn. & M.
Fig 1– Rostrohypoxylon terebratum (redrawn from Fournier et al. 2010). a Section through rostrate stroma. b Ascospores (clearly showing the ascospore germ slits). c Asci. Scale bars: a = 1mm; b-c=10 μm.
Fournier J, Stadler M, Hyde KD, Duong ML. 2010- The new genus Rostrohypoxylon and two new Annulohypoxylon species from Northern Thailand. Fungal Diversity 40, 23-36. https://link.springer.com/article/10.1007/s13225-010-0026-4
Daranagama DA, Hyde KD, Esteban B, Thambugala KM, Tian Q, Samarakoon MC, … Stadler M. 2018- Towards a natural classification and backbone tree for Graphostromataceae, Hypoxylaceae, Lopadostomataceae and Xylariaceae. Fungal Diversity 88, 1-165. https://link.springer.com/article/10.1007/s13225-017-0388-y
Maryam Fallahi, Center of Excellence in Fungal Research, Mae Fah Luang
University, Chiang Rai 57100, Thailand.
(Edited by Kevin D Hyde and Ruvishika S. Jayawardena)