Identifying a contact zone between two phylogeographic lineages of Clematis sibirica (Ranunculeae) in the Tianshan and Altai Mountains Response of tree ring width to recent climate change, south slope of Altai Mountains Sciuro-hypnum ornellanum (Molendo) Ignatov & Huttunen (Brachytheciaceaae,Bryophyta) Reported New to China Newly-Recorded Species of Acarospora from Xinjiang Spatial distribution of tree species richness in Xiaodonggou forest region of the Altai Mountains, Northwest China