Pleosporales » Phaeosphaeriaceae

Bricookea

Bricookea M.E. Barr, Mycotaxon 15: 346 (1982).

Index Fungorum number: IF 653; Facesoffungi number: FoF 00239, 2 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on Juncaceae. Sexual morph: Ascomata scattered or clustered, immersed to semi-immersed, becoming erumpent through host tissue or superficial at maturity, unito multi-loculate, globose to subglobose, glabrous, brown to dark brown, ostiole central, with slit-like opening. Peridium thin-walled, composed of brown to dark brown, pseudoparenchymatous cells, arranged in a textura angularis. Hamathecium composed of numerous, filamentous, distinctly septate, broad cellular pseudoparaphyses, anastomosing at the apex. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, narrow towards apex, short pedicellate, apically rounded, with well-developed ocular chamber. Ascospores overlapping, 1–3-seriate, phragmosporous, ellipsoidal to broadly fusiform, hyaline, septate, slightly curved, constricted at the median septum, smooth and thick-walled. Asexual morph: Unknown (adapted from Phookamsak et al. 2014).

Type species: Bricookea sepalorum (Vleugel) M.E. Barr

Notes: Bricookea is characterised by scattered or clustered, immersed to semi-immersed ascomata, bitunicate, fissitunicate, cylindrical to cylindric-clavate asci and overlapping, 1–3-seriate, phragmosporous, ellipsoidal to broadly fusiform, hyaline, septate ascospores. Bricookea sepalorum was previously known as Leptosphaeria sepalorum. Holm (1957) compared specimens from Sweden with samples from North America and reported that the ascospores and asci of the former were smaller than the latter and considered the species a synonym of Lizonia emperigonia (Barr 1982, Shoemaker & Babcock 1989, Zhang et al. 2012, Phookamsak et al. 2014). The treatment was not followed by Barr (1982) who treated Bricookea in Phaeosphaeriaceae based on the unique opening ostioles and lack of known asexual morph. Barr (1982) reported that Sphaerulina inquinans Rehm is the former name of Bricookea sepalorum but Shoemaker and Babcock (1989) re-examined the type specimens of Bricookea from S herbaria and stated that no specimen existed under the name Sphaerulina inquinans. The new species Bricookea barrae from a North American collection was introduced by Shoemaker and Babcock (1989) and re-examined by Barr (1982). Eriksson (2007) synonymized Bricookea barrae under the Lophiostoma barriae in Lophiostomataceae. Zhang et al. (2012) tentatively treated Bricookea in Phaeosphaeriaceae based on morphology. Bricookea was also placed in Lophiostomataceae based on the slit-like ostioles. Phookamsak et al. (2014) examined the collections from North America and type specimen from S herbaria and reported that both collections have similar morphological characters. The material from North America was different in having larger ascoma, asci and ascospores than the type specimen from Europe. Phookamsak et al. (2014) also treated Bricookea in Pheaosphaeriaceae based on the thin-walled peridium comprising pseudoparenchymatous cells, clavate asci with subsessile to short acute pedicel and phragmosporous ascospores. Even though Bricookea is a distinct genus in Phaeosphaeriaceae, sequence data is lacking to confirm this placement. Fresh collections, epitypification and molecular data are required to confirm the correct taxonomic placement of the genus.

 

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