Fungalpedia – Note 40 Verrucostoma


Verrucostoma freycinetiae Hirooka, Tak. Kobay. & P. Chaverri

Citation if using this entry: Fallahi et al. (2023) New genera in 2010-2011. Mycosphere (in prep)

Index Fungorum Facesoffungi, MycoBankGenBank, Fig 1.

Verrucostoma was described by Hirooka et al. (2010) in Bionectriaceae (Hypocreales). The fungus was isolated from Freycinetia boninensis (Pandanaceae) dead leaves in the Hahajima, Bonin (Ogasawara) Islands, Japan. The genus accommodates Verrucostoma freycinetiae Hirooka, Tak. Kobay. & P. Chaverri and Verrucostoma martinicense Lechat, J. Fourn. & Courtec (Hirooka et al. 2010). Verrucostoma is distinguished from other genera in Bionectriaceae and Nectriaceae by white to pale orange perithecia that form superficial, solitary, or in small groups with protuberances around the perithecial apex, no color change in 3% Potassium hydroxide and lactic acid, unitunicate asci, spinulose ascospores, and an acremonium-like asexual. Phylogenetic analyses based on α- actin, LSU, and rpb1 sequence data supported the monophyly of Bionectriaceae and Nectriaceae, hence, Verrucostoma was proposed as a new genus (Hirooka et al. 2010).


Fig 1– Schematic figures of Verrucostom freycinetiae (redrawn from Hirooka et al. 2010). a Median section of perithecium. b Ascus with eight ascospores. c Spinulose ascospores. d Perithecia on leaf of Freycinetia boninensis. e Conidiophore on OA. f Conidia on OA. Scale Bars: a= 100 µm; b, c, e, f= 20; d=500 µm.

Type species: Verrucostoma freycinetiae Hirooka, Tak. Kobay. & P. Chaverri

Other accepted species:

Verrucostoma martinicense Lechat, J. Fourn. & Courtec



Hirooka Y, Kobayashi T, Ono T, Rossman AY, Chaverri P. 2010- Verrucostoma, a new genus in the Bionectriaceae from the Bonin Islands, Japan. Mycologia 102, 418-429.


Entry by

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)