Hypodematium

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Hypodematium

Description

Plants on rocks.

Distribution

Asia-Tropical: East Asia: present Tropical Africa: present
C. 12 species in East Asia, two in Malesia. H. crenatum widespread, also in tropical Africa.

Anatomy

The vascular cylinder (after Nayar & Baipai 1970) is distinctive and has a broad, undivided ventral half and a dissected dorsal half, looking like that of Lomariopsidaceae; in adult rhizomes there are generally three irregular rows of leaf gaps dissecting the dorsal half of the stelar cylinder, the leaf gaps are clearly arranged in a spiral around the vascular cylinder, with a larger distance between successive gaps on the ventral side; the leaf gaps are large and spindle shaped and dissect the dorsal half of the stele into narrow, ribbon-like strands; leaf traces are paired, ribbon-like strands and the leaf gap extends conspicuously on the adaxial as well as on the abaxial side of them.

Citation

Fée - in Mém. Foug. 1852: 297
Ching - in Sunyatsenia. 1935: 3