Quercus acuta Thunb.

DENG, Min, LI, Qiansheng, COOMBES, Allen & XU, Jin, 2013, Typification of Quercus acuta Thunb. and Q. glauca Thunb. (Fagaceae), Phytotaxa 137 (1), pp. 27-34 : 30-31

Quercus acuta Thunb. in A. Murray, Syst. Veg. ed. 14: 858 (1784).

Lectotype (designated here):— JAPAN. "e Japonia", Thunberg C.P. s.n. [UPS-THUNB 22386] (UPS! Fig. 3). ≡ Cyclobalanopsis acuta (Thunberg) Oersted, Vidensk. Meddel. Naturhist. Foren. Kjøbenhavn 18: 78 (1866).

Additional specimens cited:

JAPAN, Kansai: Shiga, Suzumitoge in Mt. Hira, Shiga-cho , Shiga-gun , alt. 500m, 24 June 1973, Murata, G. & Nishimura 1176 (PE); Without detailed collection information, Nov. 1863, Hooker, s.n. (K) .

CHINA, Hongkong, Hongkong , Hongkong Botanical Garden, 1 July 1935, Chen, W.Y. 27317 (PE), Chen, W.Y. 10232 & 10232 A (PE, IBSC) .

Habitat: Evergreen Forest.

Distribution: This species is commonly distributed in Japan and southern Korea ( Ohashi et al. 2006, 2007), with a very limited distribution in SE China (Guangdong province and Hongkong) ( Deng et al. 2008).

Leaf epidermal features: The abaxial leaf surfaces were covered by platelet wax flake. The epidermal cells of the abaxial surface were flat and polygon-irregular in shape. The appressed lateral attached trichomes (ALA) ( Fig. 5A and B , shown by black arrows) and solitary uniseriate trichomes (U) ( Fig. 5A and B , shown by white arrows) were commonly present on the abaxial surface. The stomata were non-typical cyclocytic type. The stomata size (L × W) is 18.39 ± 0.56 × 16.84 ± 0.56 with the stomatal frequency 808.2 ± 6.8/mm 2.

Observations: Q. acuta is similar to Q. sessilifolia Blume and Q. morii Hayata. It differs from Q. morii in its almost entire leaf margin. It differs from Q. sessilifolia in its elliptic or ovate leaf blade and long petiole of about 2.0– 2.7 cm, compared to the oblong-elliptic to lanceolate-elliptic leaf blade and petiole 0.5–1.0 cm in Q. sessilifolia .

Figures

FIGURE 5. Leaf epidermal features of typical Q. acuta and Q. glauca observed under SEM and LM. bar=50 µm. A-B. Q. acuta, black arrows show ALA, white arrows show U; C-D. Q. glauca, showing the platelet wax flake and ALA on leaf abaxial epidermis.