Diatrype subundulata Lar.N. Vassiljeva & H.X. Ma, 2014

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

Diatrype subundulata Lar.N. Vassiljeva & H.X. Ma , sp. nov. ( Figs. 12 , 21 ) MB 809639

Type:— CHINA. Jilin Province: vicinity of The Red Leaves Valley of Jiaohe, Shasongling area , on dead branches of Acer mandshuricum , 30 August 2013, L. Vasilyeva, VLA P-2825, holotype !

Differs from Diatrype undulata in larger ascospores (7–9 versus 5–7 µm long) and the restriction to Acer spp.

Other specimens examined:— RUSSIA. Primorsky Territory: Ussuriysk Nature Reserve, on Acer sp. , 18 August 1962, E. Koval, VLA P-401; on A. pseudosieboldianum (Pax) Kom. , 28 April 1956, I. Bunkina, VLA P-402; Khabarovsk Territory: Big Khekhtsir Nature Reserve, on Acer sp. , 27 August 1983, L. Vasilyeva, VLA P-1370; Jewish Autonomous Region, Bastak Nature Reserve, on Acer tegmentosum Maxim. , 18 August 2004, L. Vasilyeva, VLA P-91.

Stromata usually widely effused, dark brown, studded with small 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, 35–40 × 5–7 µm in spore bearing part, stalks of different length (up to 60 µm long), containing 8 biseriate ascospores, apical ring non-amyloid. Ascospores one-celled, allantoid, yellowish, 7–9 × 1.7–1.9 µm.

Etymology:—Refers to the superficial similarity with Diatrype undulata .

The similarity of stromata in Diatrype subundulata and D. undulata could be seen at Figs. 12 and 13 , but these species differ in their ascospores. The specimens of D. subundulata from the south-east of Russia were wrongly identified as Diatrype spilomea Syd. ( Vasilyeva 2011) . The latter species has smaller ascospores comparable with those of D. undulata . The new species D. subundulata seems to be restricted to Acer spp. and the area around the Sea of Japan (north-eastern provinces of China, south of eastern Russia).

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.