Requienella Fabre, Annls Sci. Nat., Bot., sér. 6 15: 55 (1883)
MycoBank number: MB 4676; Index Fungorum number: IF 4676; Facesoffungi number: FoF 13552; 2 species with sequence data.
Type species – Requienella seminuda (Pers.) Boise.
Notes – Requienella was introduced by Fabre (1883), however, it has been shown that the three species recognised by him in Requienella belonged to other genera. Boise (1986) reinstated Requienella by typifying the genus with R. seminuda (= Sphaeria seminuda). Based on morphology, the genus was been classified in Dothideomycetes, however, Jaklitsch et al. (2016b) showed the genus belongs to the class Sordariomycetes, despite its apparently fissitunicate asci. Requienella fraxini and R. seminuda are accepted in Requienella based on morphology and sequence data and R. princeps has been transferred to Decaisnella (Barr 1990a).
Figure 219 – Requienella seminuda (a, b, d, e, h, i, j), Requienella fraxini (c, k, l), Acrocordiella occulta (j, m, n) redrawn from Jaklitsch et al. (2016b). a Ascomata. b, c Sections of ascomata. d, e Asci and paraphyses. e Apical region of asci. f-k Ascospores. Scale bars: a = 0.2 mm, b = 0.2 mm, c = 0.3 mm, d = 25 µm, d, f = 15 µm, e, k, l, n = 10 µm, i, j, m = 7 µm.