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Christensenia (plant) : ウィキペディア英語版
Christensenia (plant)
:''For the broad-nosed weevil genus, see ''Christensenia (beetle).
''Christensenia'' is a genus of ferns in the botanical family Marattiaceae. The genus is confined to the Indo-Malayan region. The basal chromosome number for this genus is 2n=80.
''Christensenia'' is unique in the Marattiaceae, because of its reticulate venation, palmately arranged leaves and radial synangia. ''Christensenia'' produces enormous amounts of spores, up to 7,000 spores per sporangium.
The presence of a radial synangium is an archaic character, very similar to some of the fossil Asterothecaceae/Psaroniaceae, such as ''Scolecopteris''. ''Christensenia'' itself has no fossil record.
==Species==
After the 1993 revision by Rolleri, only two species and one variety are recognized:
* ''Christensenia aesculifolia'' (Blume) Maxon (type species)
*
* ''Christensenia aesculifolia'' var. ''korthalsii''
* ''Christensenia lobbiana'' (de Vriese) Rolleri

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