Columnosphaeria sarothamni Munk, Dansk bot. Ark. 15(no. 2): 103 (1953).
Saprobic on twigs of Sarothamnus sp. Sexual state: Ascostromata 235–300 µm high, 260−295 µm wide ( = 267 × 282 µm, n = 10) solitary or scattered, black, immersed under the host tissue, globose to subglobose, uniloculate, ostiolate at maturity usually by dehiscence of the thin wall at the apex. Peridium 30−50 µm ( = 42 µm, n = 15) wide, comprising several layers of dark brown cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci 80−90 × 15−18 µm ( = 86 × 16.5 µm, n = 20) 8-spored, bitunicate, clavate to cylindro-clavate, short pedicellate, apically rounded. Ascospores 22−31× 5.5−9 µm ( = 27 × 7 µm, n = 20) uni-seriate or irregularly bi-seriate, partially overlapping, hyaline when young, brown at maturity, aseptate, ellipsoidal-fusiform, or fusiform, smooth-walled. Asexual state: Unknown.
Material examined: DENMARK, on Cytisus scoparius (L.) Link (Fabaceae), 12 May 1948, Anders Munk (C-F70846, holotype)
Fig. 1 Columnosphaeria sarothamni (C-F70846, holotype). a Herbarium material. b Ascostromata on the host surface. c Section through ascostroma. d Peridium. e-g Bitunicate asci. h-j Ascospores. Scale bars: c = 100 µm, d-g = 50 µm, h-j = 15 µm.