Thelypteris interrupta

Thelypteris interrupta (Willd.) K.Iwats., J. Jap. Bot. 38: 314 (1963) as per POWO;
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Cyclosorus interruptus (Willd.) H. Itô, Bot. Mag. (Tokyo) 51(608): 714 1937. (syn: Aspidium continuum Desv.; Aspidium ecklonii Kunze; Aspidium gongylodes Schkuhr; Aspidium obtusatum Sw.; Aspidium serra (Sw.) Sw.; Aspidium serratum Sw.; Aspidium unitum (L.) Sw. .; Dryopteris gongylodes (Schkuhr) Kuntze .; Dryopteris interrupta (Willd.) Ching; Nephrodium gongylodes (Schkuhr) Schott; Nephrodium paludosum Liebm.; Nephrodium propinquum R. Br.; Nephrodium unitum R. Br.; Polypodium tottum Thunb.; Pteris interrupta Willd.; Thelypteris gongylodes (Schkuhr) Kuntze ex Small; Thelypteris interrupta (Willd.) K. Iwats.; Thelypteris totta var. hirsuta (Mett.) C.V. Morton);

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Tropical & Subtropical Old World to Pacific: Andaman Is., Angola, Assam, Bangladesh, Bismarck Archipelago, Borneo, Botswana, Burundi, Cambodia, Cameroon, Cape Provinces, Caroline Is., Central African Repu, Chad, Chagos Archipelago, China South-Central, China Southeast, Comoros, Cook Is., East Himalaya, Easter Is., Ethiopia, Fiji, Gabon, Gambia, Guinea, Gulf of Guinea Is., Hainan, Hawaii, India, Ivory Coast, Japan, Jawa, Kenya, Korea, KwaZulu-Natal, Laos, Lesser Sunda Is., Liberia, Madagascar, Malawi, Malaya, Maldives, Maluku, Marianas, Marshall Is., Mauritius, Mozambique, Myanmar, Namibia, Nansei-shoto, Nepal, New Caledonia, New Guinea, New South Wales, New Zealand North, Niger, Northern Provinces, Northern Territory, Philippines, Queensland, Rwanda, Réunion, Samoa, Senegal, Society Is., Solomon Is., Sri Lanka, Sudan, Sulawesi, Sumatera, Swaziland, Taiwan, Tanzania, Thailand, Tonga, Tubuai Is., Uganda, Vanuatu, Victoria, Vietnam, Western Australia, Zambia, Zaïre, Zimbabwe as per POWO;
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Fern for ID:
This fern was photographed last week on the outskirts of Bandhavgarh National Park but its found inside the park too.
May I request you to please help in ID.

Sorry to say but the picture, pretty as it is, is not close enough so we could see the lower pinnae and lobes etc.! One has to see these things.
Still I can see it is a Thelypteris with a long-creeping rhizome and I think there are no reduced pinnae below the main part of the lamina, as far as I can see (i.e it is not T. unita) . I feel fairly confident it is T. interrupta, which grows in wet, marshy places, with the rhizome submerged in the rainy seaon and forms such colonies. If so the sori will be up around the apices of the pinna-lobes and the pinnae will be lobed only to half way to the costa, or less.
It is a common species of lowland marshes.
One other thing, people publishing on reserves and parks often just give the reserve name – which no-one but a handful of people will know where it is. Also not marked on most maps. Can you tell us what district and STATE it is in so we can have some idea of what flora would be there?

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Id fern plz : Attachments (1). 6 posts by 3 authors.

This is Thelypteris (Sect. Cyclosorus) interrupta, a low-altitude marsh fern, occurring from Nepal and Bihar eastwards, and in peninsular India, including the South – it is a S.E. Asian (Malesian) element in India.
There are big colonies of it (spreading by its long-creeping rhizomes) around and in the ponds at the Indian Botanic Garden, Kolkata.

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This is Cyclosorus interruptus
Marsh Fern – growing in marshy lands

I wonder if … or anyone could outline the morphological distinction between Cyclosorus and Thelypteris as genera? It seems to me the differences are minute and not practicably separable at the level of genus. Cutting up the molecular “tree” is actually an arbitrary process, and should depend also on morphological characters.
But the taxonomic and cladonomic decisions also need to consider the extensive and strong similarities between all five American-led “genera” within Thelypteris, which all show the same and easily recognisable pattern – all obvious Thelypteris. The fact that, molecularly, both free-veined and anastomosing-veined groups of species are consigned to “Cyclosorus” really makes the distinctions minute and insignificant and Cyclosorus almost indefinable except, perhaps by a microcharacter. I prefer to go along with what Holttum said – that the only practical or sensible alternative to splitting (into his far too many genera, now no longer recognised world-wide, but good as natural sections), would be to reunite them all into the single genus, Thelypteris.

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