Studies On Taxonomy And Flora Of Grimmiaceae (Musci) In Inner Mongolia, China

Grimmiaceae plants are perennial mosses, commonly found in exposed arid regions, or on wet or dry sand on the rocks. As the species grown in different environments and sometimes showed a greater variation, also because of the existence of different classification systems, the species classification and system location and other issues of Grimmiaceae still in doubt. In this paper, the various citations were verified by consulted domestic and international data, the plant specimen informations were re-classified, organized and further identified, the species’morphological characteristics plates and geographic distribution maps were given, genus and species-level keys were provided. Study for Grimmiaceae species in Inner Mongolia can make the informations of species in this family more accurate, determine the floristic composition and characteristics, summarize the typical features of all species, provide informations for classification of mosses in Inner Mongolia and China. As the study for species composition, floristic composition in some aspects of Grimmiaceae, some conclusions were drawn as follows:1. According to statistics,6 genera,21 species and 1 varieties of Grimmiaceae are included in Inner Mongolia. Souted out Grimmia crassiuscula, G. ulaandamana and Jaffueliobryum wrightii var. rhombicum, which had been reported in recent years as China new or variant species; Schistidium lancifolium was reported as China new recorded species; Grimmia longirostris, G. montana and G. obtusifolia are new recorded species in Inner Mongolia, Coscinodon cribrosus is new recorded species in Helan Mountain.2. Collected the specimen informations of Grimmiaceae shows that genus with a single species or a few species accounted for 50% of total genera in Inner Mongolia, this suggests species composition of each genus is relatively poor. C. cribrosus and some others species have particular single locations, and the number of specimens so poor, this indicates that the locations of species in Grimmiaceae are stenosis.3. The family is divided into four major plants geographical elements, namely the cosmopolitan elements (4), north temperate elements (13,72.22%), Old World temperate elements (1,5.56%) and elements endemic to China (4,22.22%). This shows that the Grimmiaceae flora in Inner Mongolia has obvious temperate nature.4. The floristic studies between Inner Mongolia and other areas in China shows that Inner Mongolia, Henan Province and Tibet have higher species similarity coefficient, Guangdong Province has the lowest abundance index and genus and species similarity coefficient. Tibet has the highest abundance index, and the second one is Inner Mongolia.5. Based on the comparison of Grimmiaceae in 11 plant states in Inner Mongolia, the order about numbers of species arranged from more to less as follows:Helan Mountain state(59.10%)> Daxinganling southern state, Daxinganling northern state (54.55%)> Yinshan mountain state (40.91%)> Yin Shan loess hills state> Eastern Mongolian Plateau state> Northern Yanshan state> Wulanchabu state, Longshou mountain state> Daxinganling western State, Daxinganling eastern state> Ordos Plateau state.