Odontosoria chinensis subsp. tenuifolia

Odontosoria chinensis subsp. tenuifolia (Lam.) Fraser-Jenkins & Kandel (syn: Adiantum tenuifolium Lam. (ambiguous synonym); Davallia tenuifolia (Lam.) Sw.; Lindsaea tenuifolia (Lam.) Mett. (ambiguous synonym); Microlepia tenuifolia (Lam.) Mett. (ambiguous synonym); Odontosoria chinensis var. tenuifolia (Lam.) Matsum.; Odontosoria chinensis var. tenuifolia (Sw.) Bonap.; Odontosoria chusana var. tenuifolia (Lam.) Masam.; Odontosoria tenuifolia (Lam.) J.Sm.; Sphenomeris chinensis var. tenuifolia (Lam.) C.Chr.; Sphenomeris chinensis var. tenuifolia (Lam.) N.C.Nair; Sphenomeris chusana var. tenuifolia (Lam.) C.Chr.; Stenoloma tenuifolium (Lam.) Fée);     

China, Taiwan, Ryukyu Isl., India (Andhra Pradesh, Arunachal Pradesh, Assam State, Chhattisgarh, Goa, Karnataka, Kerala, Madhya Pradesh, Meghalaya, Odisha, Tamil Nadu, Uttarakhand, West Bengal), Thailand, Myanmar [Burma], Bhutan, Nepal, SE-Asia, peninsular Malaysia, Sri Lanka as per Catalogue of Life;
 

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Sphenomeris chinensis (L.) Maxon. (?) from Kamrup district (Assam):  
Attached fern images may be Sphenomeris chinensis (L.) Maxon. (?)
Date : 21.12.2012
Location: Rani forest, Kamrup district (Assam)
Family : Dennstaedtiaceae
Genus & species : Sphenomeris chinensis (L.) Maxon. (?)
Habitat: Grows wild on hilly slopes
Habit : Herb
Yes, that's correct, it's Sphenomeris chinensis, or as I prefer, Odontosoria chinensis (also molecularly cladonomised as Bierhorstia chinensis, but not so much fitting in with the morphological taxonomy, which I believe must also be considered!).
There is an apparently separate cytotype from South India, Lanka and parts of SE Asia, described as O. tenuifolia, which is subtly different in having rather wider segment-apices and slightly shorter segments - I think the best treatment for that is as a subsp. tenuifolia as the two are so close, but usually distinguishable, it seems. Subsp. tenuifolia is also turning up now in N.E. India as well. Rather ironic that the entity named "tenuifolia" is actually thicker and wider in its parts than chinensis proper - but no matter. After all there's a Lathyrus japonicus that actually came from Britain and does not occur in Japan at all, or E. Asia! - its locality told to Linnaeus was a mistake - but it is still known as L. japonicus even so! 
O. chinensis is very common at lower altitude through all the C. and E. Himalaya and C. and S. India - but can't go very far west in the Indo-Himalaya, not beyond Uttarakhand, I think (?memory!), as it gets too dry for it at certain seasons. It is one of the commonest roadside weeds around the Kathmandu valley, but try as you might, it seems you simply cannot transplant it, or it immediately dies! Several ferns are like that, also Palhinhaea ("Lycopodiella") cernua - that pretty clubmoss, would be so nice to grow, but it will only grow where it wants to by spores - can't be moved. Dipteris wallichii, though a common roadside weed in far NE India is very hard to grow too. 
Both Odontosoria and Palhinhaea (and Dipteris to some degree) grow in similar habitats on semi-open clay banks of paths and roads.

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Odontosoria chinensis (L.) J. Sm. SN26420b : 3 posts by 2 authors. Attachments (1) - 4 mb.
Odontosoria chinensis (L.) J. Sm.(=Sphenomeris chinensis (L.) Maxon) wild terrestrial fern from Western Ghats Tamilnadu.

Yes, that's odontosoria chinensis subsp. tenuifolia

 
 
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