Table 4. Number of Didymodon species along the altitude gradient and under different precipitation regimes in Tibet.

Altitude (m)	Arid zone	Semi-arid zone	Humid zone	Total
2800–3000	0	4	5	7
3000–3500	0	7	1	7
3500–4000	0	17	2	19
4000–4500	8	13	7	18
4500–5000	16	21	0	21
5000–5600	10	17	0	17
Total	17	22	9	22