Acanthostigmina minuta (Fuckel) Clem. & Shear, Gen. Fung. (Minneapolis): 270 (1931),
Lasiosphaeria minuta Fuckel, Jb. nassau. Ver. Naturk. 23-24: 148 (1870)


Saprobicon decaying wood of a rotten branch of Fagus sylvatica. Sexual state:Ascomata(211-)234–299 µm high × (216-)226–270 µm diam., superficial, solitary, scattered, occasionally clustered, globose-subglobose, dark brown, ostiolate, surrounded by sparse, erect, dark brown to black setae, (30-)56–84(-105) µm long, tapering towards an acute end at apex. Peridium 29–34 µm wide, with several layers of brown to reddish-brown cells, comprising textura angularis to subglobosa, inwardly with small brown cells of textura subprismatica. Hamatheciumcomprising ca. (1-)1.5–2 µm wide, numerous filiform, septate, branched, hyaline to pale brown pseudoparaphyses, embedded in a gelatinous matrix. Asci (73-)84–118 ´ 20–29.5 µm ( = 98 × 24 µm, n = 20), 8-spored, bitunicate, broadly cylindric-subclavate, pedicellate, thickened at apex, without an ocular chamber. Ascospores (42-)47–60 ´ 6–9 µm ( = 52 × 7 µm, n = 20), 2–3-seriate, elongate-fusiform, curved, tapering towards rounded ends, (6-)7–9-septate, broader at fourth and fifth cells from apex, slightly constricted at septum, hyaline to pale brown when mature, occasionally surrounded by a mucilaginous sheath, smooth-walled. Asexual state:Unknown.

Material examined: GERMANY, Bavarian Alps Mts., Kampenwand, elev. ca 1200 msl., on decaying wood branch of Fagus sylvaticaL. (Fagaceae),June 1904, Rehm H., Ascomyceten no. 1568 (BPI 624355).

Fig. 1 Acanthostigmina minuta (BPI 624355).a Ascomata. b LS of ascoma. c Setae. d Peridium. e Pseudoparaphyses. f, g Asci. h, i Ascospores. Scale bars: a-b=200µm, c-d, f-i=50µm, e=5µm