Cryptosphaeria venusta Lar.N. Vassiljeva

Vasilyeva, Larissa & Ma, Haixia, 2014, Diatrypaceous fungi in north-eastern China. 1. Cryptosphaeria and Diatrype, Phytotaxa 186 (5), pp. 261-270 : 264

Cryptosphaeria venusta Lar.N. Vassiljeva , Nova Hedwigia 43: 374. 1986 ( Figs. 5 , 17 )

Specimens examined:— CHINA. Jilin Province: Changbai Mountain National Nature Reserve, Dayangcha area, on Betula sp. , 4 August 2008, L. Vasilyeva, VLA P-2174; Huangsongpu area, on Betula sp. , 27 August 2013, L. Vasilyeva, VLA P-2817.— JAPAN. Tochigi Prefecture: Ashio, on Betula sp. , 28 June 1999, L. Vasilyeva, VLA P-1480.

Stromata immersed in bark remaining unchanged or becoming inflated, irregular, usually spot-shaped, surrounded by a black line deeply in the back, recognized by the crowded and separately emerging tops of short perithecial beaks (ostioles) which are rather prominent, black and divided in a cross-shaped manner, 300–400 µm diam.; perithecia monostichous or distichous, scattered or aggregated, singly erumpent, 350–400 µm diam.Asci cylindrical, paraphysate, 30–40 × 6–7 µm, in spore bearing part, containing 8 biseriate ascospores, apical ring indistingishable.Ascospores onecelled, allantoid, hyaline, 7–10 × 1.5(–2) µm.

The species is restricted to Betula spp. and the area around the Sea of Japan (north-eastern provinces of China, Japan, south of eastern Russia).

Figures

FIGURES. 1–5. Surface of stromata of Cryptosphaeria species: 1. C. exornata. 2. C. eunomia. 3. C. nigrescens. 4. C. ligniota. 5. C.venusta. Scale bars: 1 = 1,4 mm; 2–5 = 1 mm.

FIGURES. 14–22. Ascospores Cryptosphaeria and Diatrype species: 14. C. exornata. 15. C. ligniota. 16. C. nigrescens. 17. C. venusta. 18. D. hypoxyloides. 19. D. platystoma. 20. D. stigma. 21. D. subundulata. 22. D. undulata. Scale bars: 14, 15, 20 = 3.5 µm, 16, 18, 21, 22 = 4 µm, 19 = 5 µm, 17 = 6 µm.