Saccothecium sepincola (Fr.) Fr.

[as ‘saepincola’], Summa veg. Scand., Section Post. (Stockholm): 398 (1849).

 ≡ Sphaeria sepincola Fr. [as ‘saepincola’], Observ. mycol. (Havniae) 1: 181 (1815)

Saprobic on twigs, and branches of Rosa and Crataegus sp. Sexual state: Ascomata 105–135 µm high, 80−105µm wide ( = 121 × 95 µm, n = 10), black, immersed to erumpent, solitary or scattered, globose to subglobose, usually uniloculate, rarely biloculate without a distinct ostiole. Peridium 14−36 µm ( = 22 µm, n = 15) wide, a single layer, composed of brown to lightly pigmented cells of textura angularis, near the base connected to the host tissue. Hamathecium lacking pseudoparaphyses. Asci 38−64 × 11−16 µm ( = 50 × 14 µm, n = 20), 8-spored, bitunicate, saccate to broadly clavate or cylindric-, with a short bifurcate pedicel and a distinct ocular chamber. Ascospores 14−20 × 4−6 µm ( = 16.9 × 5 µm, n = 25), overlapping biseriate, hyaline, 3−6-septate, sometimes 1 vertical septate, asymmetric, obovoid, fusiform to clavate, with broadly to narrowly rounded ends, with broad upper cells, smooth-walled. Asexual state: Unknown.

Material examined: ITALY, Collinaccia – Castrocaro e Terra del Sole (province of Forlì-Cesena [FC]), on the twigs of Cornus sanguinea (Cornaceae), 3 March 2013, Erio Camporesi (MFLU 14−0276).

 

Fig. 1 Saccothecium sepincola (MFLU 14−0276). a, b Appearance of immersed ascostromata on the host surface. c, d Section through ascostromata. f-i Bitunicate asci. j-m. Released ascospores. Scale bars: c-e = 50 µm, f-i = 25 µm, j-m= 10 µm.