多孔茨藻 duo kong ci zao

Caulinia foveolata (A. Braun ex Magnus) Nakai.

Stems 10-20 cm tall, 0.5-1 mm in diam. Leaves linear, slender, 2-2.5 cm × 0.2-0.5 mm; sheath 2-2.5 mm; auricles obcordate, minutely serrulate with 4-9 teeth at apex and outer side; leaf margin on each side minutely serrulate with 6-24 teeth. Plants monoecious; flowers solitary, male flowers in upper axils and female flowers throughout. Male flowers elliptic, ca. 1 mm; spathe with a short neck, with several brownish spine cells at apex; anther 4-thecous. Female flowers ca. 2.5 mm; style ca. 1 mm; stigmas 2-lobed, unequal. Fruit narrowly ellipsoid, ca. 1.5 × 0.5 mm. Seeds narrowly ellipsoid, with ca. 20 rows of pits; areoles subsquarish to polygonal. Fl. and fr. Aug-Sep. 2n = 12*, 24, 36.

Ponds. Anhui, Guangxi, Hubei, Taiwan, Zhejiang [India, ?Indonesia, Malaysia].

Previously, this species was known only in China from S Guangxi.