丽水眼子菜,浙江产眼子菜属一新变种

Potamogeton distinctus var.lishuiensis,A New Variety of Potamogetonaceae from Zhejiang,China

描述了采自浙江丽水莲都葑垟湖的眼子菜属Potamogeton(眼子菜科Potamogetonaceae)一新变种:丽水眼子菜Potamogeton distinctus var.lishuiensis.丽水眼子菜与模式变种眼子菜的区别主要于叶片基部浅心形或圆形,果实较长,4.5~5mm.对两者茎的解剖结构观察表明,丽水眼子菜通气组织的机械束发达,内皮层厚壁细胞U形增厚,而眼子菜的茎的通气组织内机械束不发达,内皮层的厚壁细胞为O形.

Potamogeton distinctus var.lishuiensis,a new variety of Potamogetonaceae from Zhejiang,eastern China,is described and illustrated.This new variety differs from the typical one in having leaf blades slightly cordate or rounded at base,fruits longer,4.5~5mm long.Comparison of the stem anatomy of Potamogeton distinctus var.distinctus and var.lishuiensis,the former has mechanical bundle not well-developed in aerenchyma,and endodermis cells O-shaped,while the latter has mechanical bundle well-developed in aerenchyma,and endodermis cells U-shaped.