Diatrype stigma (Hoffm.) Fr., Summa

Vasilyeva, Larissa & Ma, Haixia, 2014, Diatrypaceous fungi in north-eastern China. 1. Cryptosphaeria and Diatrype, Phytotaxa 186 (5), pp. 261-270 : 267-268

Diatrype stigma (Hoffm.) Fr., Summa veg. Scand., Section Post.: 385. 1849 ( Figs. 11 , 20 )

Specimens examined:— CHINA. Heilongjiang Province: Hulin vicinity, on Quercus mongolica , 4 September 2003, L. Vasilyeva, VLA P-1524; Raohe vicinity, on Quercus mongolica , 7 August 2004, L. Vasilyeva, VLA P-1525); Jilin Province: Changbai Mountain National Nature Reserve, Hanconggou area, 28 August 2013, H-X. Ma, FCATAS-301.

Stromata usually widely effused, different shades of brownish tinges, studded with darker and stellate ostiloles, surrounded by a black line within the substrate; perithecia monostichous or distichous, singly erumpent, 150–200 µm diam., with short ostiolar necks.Asci cylindrical, paraphysate, 25–30 × 5–7 µm in spore bearing part, stalks of different length, containing 8 biseriate ascospores, apical ring indistinguishable. Ascospores one-celled, almost straight and hyaline, very thin, 6–8 × 1.5–2 µm long.

Many collections of this species are often misidentified and should be assigned to other species. The current concept of Diatrype stigma (www.speciesfungorum.org) includes D. decorticata (on Fagus ) and D. undulata (on Betula ) that were already segregated by Rappaz (1987). Since many distrypaceous species prefer certain genera of host plants, it would be better approach to identification more cautiously. D. stigma is one of the most common species in China ( Tai 1979; Teng 1996), but its indication “on dead limbs of frondose trees" does not allow the knowledge of accurate area.

Figures

FIGURES 9–13. Stromata of Diatrype species: 9. D. hypoxyloides. 10. D. platystoma. 11. D. stigma. 12. D. subundulata. 13. D. undulata. Scale bars: 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.