Quercus disciformis Chun & Tsiang., J. Arnold Arbor. 28: 324 (1947)

Binh, Hoang Thi, Ngoc, Nguyen Van, Bon, Trinh Ngoc, Tagane, Shuichiro, Suyama, Yoshihisa & Yahara, Tetsukazu, 2018, A new species and two new records of Quercus (Fagaceae) from northern Vietnam, PhytoKeys 92, pp. 1-15 : 10

Quercus disciformis Chun & Tsiang., J. Arnold Arbor. 28: 324 (1947) Fig. 4

Cyclobalanopsis disciformis (Chun & Tsiang) Y.C. Hsu & H.W. Jen, Acta Bot. Yunnan. 1: 148 (1979).

Type.

CHINA. "Hsin-I Hsien, Ling-Tung Pao, Chung-Tung", 3 Aug. 1931, C. Wang 31087 (holotype-IBK [catalogue no. IBK00081941, image!], isotype-IBSC [catalogue no. 0117316, image!]) .

Specimens examined in Vietnam.

Ha Noi, Ba Vi District, Ba Vi National Park , in evergreen forest: alt. 737 m, 21°04'33.88"N, 105°22'03"E, 12 Sept. 2016, Binh et al. V 6052, V6053, V6058 [fr.] (FU); alt. 1172 m, 21°03'34.1"N, 105°21'54.1"E, 11 Sep. 2016, Binh et al. V6040 [fr.] (FU) .

Distribution.

China (Guangdong, Guangxi, Guizhou, Hainan, Hunan) and Vietnam (Ba Vi National Park).

Ecology in Vietnam.

In the field survey, only three individuals were found at an altitude of 737 m and one at 1172 m; in evergreen forest.

Phenology.

Flowering from March to April, fruiting from August to September in China (Huang 1999). Fruiting in September in Vietnam.

GenBank accession no.

Binh et al. V6058: LC331258 (rbcL), LC331255 (matK).

Preliminary conservation status.

Quercus disciformis is widely distributed from Guizhou to Guangdong and Hainan in China and not recorded as a threatened species in IUCN (2017). The Vietnamese population in Ba Vi National Park extends its distribution range, representing the south western limit. Given the situation, the population in Vietnam is locally important but the category Least Concern (LC) ( IUCN 2012, Ban et al. 2007) would be appropriate for this species.

Figures

Figure 4. Image of Quercus disciformis Chun & Tsiang. from Binh et al. V 6058 (FU) A Leafy twig B Abaxial side of mature leaf C-D Infructescence and mature fruit E Nut F Cupule G Bottom of nut H Vertical section of nut.