Murispora rubicunda (Niessl) Yin. Zhang, J. Fourn. & K.D. Hyde
≡ Pleospora rubicunda Niessl, Notiz. pyr .:31(1876)
= Massariosphaeria rubicunda (Niessl) Crivelli, Ueber die heterogene Ascomycetengattung pleospora rabh.; Vorschlag füreine Aufteilung (Diss. Eid genössischen technischen hochschule Zürich 7318): 144 (1983)
= Karstenula rubicunda (Niessl) M.E. Barr, N. Amer .Fl., Ser.2(New York) 13: 52 (1990)
Index Fungorum number: IF515477
Sexual morph: Ascomata 170–200 μm × 380–410 μm, scattered to gregarious, immersed, lenticular, apex laterally flattened, black, slightly protruding, opening through a small, rounded pore, substrate stained purple. Peridium 15–18 μm thick at sides, composed of 3–4 layers cells of textura angularis, up to 28–30 μm thick at the apex with very thick-walled cells, pseudoparenchymatous, nearly absent at the base. Hamathecium of narrowly cellular pseudoparaphyses, 1–1.7 μm broad, embedded in mucilage. Asci 124– 142×19–21 μm, 8-spored, bitunicate, fissitunicate, biseriate, cylindro-clavate with a small ocular chamber, with short pedicels. Ascospores 30–38 × 10– 12 μm, curved-fusoid with narrowly rounded ends, golden yellow turning brown when senescent, 7–9 transversally septate, constricted at the septa, with one, rarely two longitudinal septa in all cells except end cells which are often slightly paler, all cells filled with a large refractive guttule, smooth to finely verruculose, surrounded by a wide mucilaginous sheath. Asexual morph: Phoma sp.
Specimen examined: FRANCE, Haute Garonne, Avignonet, Lac de Rosel, 16 Jan. 2007, on submerged dead herbaceous stem (Dipsacus?), leg. Michel Delpont, det. Jacques Fournier (IFRD 2017).
Notes: Murispora was introduced based on Pleospora rubicunda which is characterized by immersed, erumpent or nearly superficial, globose to subglobose, elongated weakly papillate ascomata which stain the woody substrate purple, trabeculate pseudoparaphyses, 8-spored, bitunicate, fissitunicate, oblong to clavate asci, fusoid, pale or reddish brown, muriform ascospores (Zhang et al. 2009). A phylogenetic study indicated that Murispora forms a robust clade with species of Amniculicola, and Amniculicolaceae was introduced to accommodate them (Zhang et al. 2009). Murispora rubicunda forms a robust clade with species of Amniculicola and Neophaeosphaeria (Zhang et al. 2009). As has mentioned by Eriksson (1981, P. 135), the purplestaining species of Pleospora, treated by Webster (1957), should not belong to the Pleosporaceae. Both Pleospora straminis and P. rubelloides should be closely related to Murispora.
Eriksson O.E. (1981) The families of bitunicate ascomycetes. Opera Bot 60:1-220
Webster J. (1957) Pleospora straminis, P. rubelloides and P. rubicunda, three fungi causing purple-staining of decaying tissues. Trans Br Mycol Soc 40:177–186
Zhang Y., Crous P.W., Schoch C.L. and Hyde K.D. (2012) Pleosporales. Fungal diversity, 53(1): 1-221. https://doi.org/10.1007/s13225-011-0117-x
Zhang Y., Fournier J., Crous P.W., Pointing S.B., Hyde K.D. (2009) Phylogenetic and morphological assessment of two new species of Amniculicola and their allies (Pleosporales). Persoonia 23:48-54