Thuja standishii

Sun, Bin, Cui, Yi-Ming, Wang, Hai-Feng, Ferguson, David K., Xiang, Qiao-Ping, Ma, Qing-Wen & Wang, Yu-Fei, 2015, Recognizing the species of Thuja (Cupressaceae) based on their cone and foliage morphology, Phytotaxa 219 (2), pp. 101-117 : 105-107

T. standishii

Seed cones broadly ovate ( Fig. 2D ), 7–12 (–14) mm× 6–7 mm. Bract-scale complexes 4–5 (–6) pairs, the second whorl rhombic, apex obtuse, base obtuse, umbo apex acute ( Fig. 2I ).

Facial leaves with obvious glands, lateral leaves with inturned apex, overlapping between the adjacent lateral leaves ( Fig. 2N ). Leaf apex obtuse or acute, without micro-teeth.

Almost no stomata on the abaxial surface of facial leaves, 2 triangular shaped stomatal bands on the proximal part of adaxial surface ( Figs. 4A, B ).

Subsidiary cells with high anticlinal walls, straight and continuous, margin serrate, periclinal wall smooth, the base of inner surface of papilla without thickening ( Figs. 6B , 10B , 12B ).

The inner surface of epidermal cells with low anticlinal walls, straight and continuous, margin smooth, periclinal wall smooth ( Fig. 12A ).

Figures

FIGURE 2. Characters of cones, bract-scale complexes and tip branches of Thuja. A, F, K, T. koraiensis; B, G, L, T. occidentalis; C, H, M, T. plicata; D, I, N, T. standishii; E, J, O, T. sutchuenensis.—Arrows pointing to the umbo; Scale bars = 2 mm.

FIGURE 4. The distribution of stomata on the abaxial and adaxial surfaces of facial leaves and the apex of facial leaves. A–B, T. standishii; C–D, T. sutchuenensis.—DFL: abaxial facial leaves; VFL: adaxial facial leaves; Scale bars: A, C = 0.5 mm; B, D = 0.1 mm.

FIGURE 6. The arrangement of stomata and subsidiary cells on the abaxial surface of facial leaves A–B, T. standishii; C–D, T. sutchuenensis.—SC: subsidiary cell; FL: Florin ring; Scale bars: A, C = 50 μm; B, D = 10 μm.

FIGURE 10. Characters of the outer surface and inner surface of stomata on the abaxial surface of facial leaves. A–B, T. standishii; C–D, T. sutchuenensis.—FL: Florin ring; Pa: papilla; Scale bars = 20 μm.

FIGURE 12. Characters of the inner surface of epidermal cells in stomatal area and non-stomatal area on the abaxial surface of facial leaves. A–B, T. standishii; C–D, T. sutchuenensis.—IP: inner surface of papilla; Scale bars = 20 μm.