Pteridium revolutum

Pteridium revolutum (Blume) Nakai, Bot. Mag. (Tokyo) 39(461): 109 109 1925. (Syn: Pteris villosa Fée;                            Pteridium aquilinum var. osmundoides H. Christ ex H. Lév.; Pteridium aquilinum subsp. wightianum (J. Agardh) W.C. Shieh; Pteridium aquilinum var. wightianum (J. Agardh) R.M. Tryon; Pteridium aquilinum subsp. wightianum (J. Agardh) Á. Löve & D. Löve; Pteridium capense var. densa Nakai; Pteris densa Wall.; Pteris recurvata var. wightiana J. Agardh; Pteris revoluta Blume;  Pteris wightiana Wall.);

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Tropical & Subtropical Asia to N. Australia: Assam, Borneo, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, India, Jawa, Laos, Malaya, Maluku, Myanmar, Nepal, New Guinea, Northern Territory, Pakistan, Philippines, Queensland, Sri Lanka, Sulawesi, Sumatera, Taiwan, Thailand, Tibet, Vietnam, West Himalaya as per POWO;
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281011-MS – 63- Fern ID requested:
Please identify the fern, which is wild and seen all around the area near Abbi Falls, Coorg. Photos taken on 23.10.11.

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Looks like a Diplopterygium.

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No it is not Diplopterygium/Gleichenia – that is quite different and also not present in South India.

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This is Pteridium revolutum (Blume) Nakai, which occurs commonly almost throughout India. You will find it referred to as P. aquilinum sometimes, especially in 19th Century literature, or in works that are not aware of modern fern taxonomy – but that species is European and African, and not present in India.
Both species are well known to be toxic to cattle, humans etc. and a lot has been published on the effects of the named alkaloids present – e.g. bovine Haematonurea and cancers etc.

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Could be Hypolepis resistens. If there had been a closeup of the lower surface of the leaf, one could say something with certainty

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Please look at it more carefully – it is quite clearly and definitely the Pteridium, as I said. Hypolepis is far more finely dissect – the third photo magnifies quite well and shows without any doubt at all that it is Pteridium revolutum. This does not need to be confused any further.

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WELL YOU ARE CORRECT … my only objection is THAT IF THE FERTILE PORTION HAD BEEN PHOTOGRAPHED! ONE COULD BE CERTAIN

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Ah yes, that’s definitely right – I agree it wasn’t a very informative photo in many respects!

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Kas Week: PKA12— Fern from Kas:
Came across this plant near kas Lake, Satara.
Date: 02-10-2009.

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This is Pteridium revolutum, the S. Asian Bracken, a poisonous fern (though not as poisonous as Thelypteris arida!).

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Fern from Kas? – indiantreepix | Google Groups: 1 image.
Came across this plant near kas Lake, Satara.
Date: 02-10-2009.

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Pteridium revolutum as per Kas Week: PKA12— Fern from Kas

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Satara, Oct 2014 :: Requesting ID – fern :: ARKNOV-34 : 5 posts by 2 authors. Attachments (5)
Requesting to please provide ID of this fern captured near Satara, Maharashtra in October 2014.

I repeat it is Pteridium revolutum (syn. P. aquilinum subsp. wightianum).

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References:
POWO