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During the process of studying the diatom diversity of Hunan Province, we find that a Cymbella species collected from Xiang River possesses the following diagnostic features:(1)Cells are small and their lengths are less than 29 μm;(2)Valves exhibit slight dorsiventrality;(3)Distal raphe fissures are dorsally deflected;(4)Apical pore fields are very small and composed of 1-3 transapical rows of porelli, which comprise two forms, one is slit-like, similar to the areolae on the valve face, and the other is rounded with internal openings covered by the flap-like silica projections;(5)Striae 10-12/10 μm at the dorsal middle part, 11-13/10 μm at the ventral middle part, and areolae 30-40/10 μm;(6)And 1-2 stigmata exist near the valve ventral central area. After comparing this species with the type population of Cymbella pavanaensis A. Vigneshwaran et al., in this paper, it is identified as C. pavanaensis. This paper provides a clearer knowledge of the ultrastructure of C. pavanaensis, enlarges its geographical distribution region, and reports it for the first time in China. [ABSTRACT FROM AUTHOR]

As provincial new distributions, one genus and eight species(including two varieties)of dicotyledon from West Hubei and Northwest Hunan are reported in this paper. Among these species, new distributions of Hubei are Tubocapsicum anomalum, Thalictrum alpinum var. elatum, Sanguisorba filiformis, S. officinalis var. glandulosa, Embelia undulate, Physaliastrum chamaesarachoides, Mentha sachalinensis and Salvia tricuspis. Among these species, Tubocapsicum anomalum belongs to Tubocapsicum, which is a newly recorded genus in Hubei. New distribution of Hunan is Gleadovia mupinense. According to IUCN Red List Criteria, G. mupinense is regarded as endangered(EN). These new distributions enrich floristic region of central China and have some significance for plant protection. [ABSTRACT FROM AUTHOR]