紫萼藓科植物茎及叶的解剖学研究（续）

对在一号冰川这种极端环境下生长的4种紫萼科植物，茎及叶的内部结构和表面进行解剖学观察，结果表明：直叶紫萼(Grimmia elatior Bruth ex Bals. et Dt Not.)叶中肋背面突出不明显，表面角质层纹饰呈条状纵列；叶腹面有少量鳞片状附属物；卷边紫萼藓(Grimma donniana Sm.)茎表皮细胞强烈凹陷，使其表面呈波浪状，中肋细背面突出；垫状紫萼藓(Grimmia pulvinata (Hedw) Sm.)叶中肋在叶背、腹面均为凸型，无小形厚壁细胞，茎、叶细胞中均含大量的淀粉粒；南欧紫萼藓(Grimmia tergestina Tomm.ex B.S.G)叶背、腹面细胞凹陷明显，角质层厚，皱褶粗糙，遮盖着凹陷的表皮细胞，中肋凸出明显。这些细微特征可成为藓类植物分类学的依据之一。

Anatomical Structure of Stems and Leaves of Grimmiaceae(Continue)

Four species of Grimmiaceae growing in Tian shan glacier one were observed their micro structure and appearance character by paraffin wax section and scanning electron microscopy.It showed that no obvious protrusion of costa dorsum was in leaves of Grimmia elatior Bruth ex Bals et Dt Not.The ornamentation of surface stratum had longitudinal strips and the squama-like appurtenance was on the back leaves.The epidermal cells in stems of Grimmia donniana Sm.sink deeply.to form wavilness and the costa were thin dorsum with prominence.The costa of back andventral leave epidermal calls of Grimmia pulvinata(Hedw) Sm without microstereid are umbonate and plenty of starch grains were in stem and leave cells.The epidermal cells of back and ventral leaves of Grimmia tergestina Tomm.ex B.S.G were deepiy concave thick cuticular and rougae,larvating the concarve epidermal cells,abd costa protrude obviousy.These features will be a basis of taxonomy for Moss.