Sydowia gregaria Bres., Hedwigia 34(Beibl.): 66 (1895).

Parasitic or saprobic on branches of conifer trees. Sexual state: Ascostromata 190–255 μm wide, black, immersed, becoming erumpent, gregarious, scattered, globose to subglobose, coriaceous, uniloculate, with a papillate to rounded short ostiole. Peridium up to 32–65 μm thick several layers thick, composed of dark brown cells of textura angularis, more darkened on the outside. Hamathecium lacking pseudoparaphyses. Asci 78−105 × 12−17 µm ( = 95.5 × 13.3 µm, n = 15), polyspored, bitunicate, clavate to oblong, with a short pedicel, apically rounded. Ascospores 10−14 × 3−4.2 µm ( = 12.3 × 3.6 µm, n = 30), crowded to overlapping, hyaline,  transversely 2 to 3-septate, constricted at the primary septum, elliptic, obovate, smooth-walled. Asexual state: Unknown.

Material examined: GERMANY, Berlin, Steglitz bei Berlin, on branches of Picea abies (L.) H. Karst (Pinaceae), October 1894, P. Sydow (S-F6473, holotype).


Fig. 1 Sydowia gregaria (S-F6473, holotype). a Herbarium material. b, c Ascostromata on host surface. d, e Section of ascostromata. f Close up of the peridium. g-i Bitunicate asci. j-m Ascospores. Scale bars: d, e = 100 µm, f = 50 µm, g-i = 50 µm, j-i = 5 µm.