Pteris biaurita L.
subsp. fornicata Fraser-Jenk.
, Taxon.
Revis. Indian Subcontinental Pteridophytes
116. 2008 [27 Nov 2008] (syn: Pteris cumingii Hieron.; Pteris flavicaulis Hayata; Pteris pacifica Hieron.; Pteris pacifica var. eximia (Rechinger) C.Chr.; Pteris pectinata D.Don (ambiguous synonym); Pteris quadriaurita var. eximia Rechinger);   
 
Tibet, China (Guangdong, Guangxi, Hainan, Yunnan), Taiwan, Sri Lanka, India
(Arunachal Pradesh, Assam State, ?Bihar, Himachal Pradesh, Karnataka, Kerala,
Madhya Pradesh, Maharashtra, Manipur, Meghalaya, Mizoram, Nagaland, Tripura,
Sikkim, West Bengal, Uttarakhand, West Bengal), Nepal, Bhutan, Bangladesh,
Myanmar [Burma],
Thailand (widespread), Vietnam, Cambodia, Laos, peninsular
Malaysia (mostly in the north), Andaman Isl., Philippines, Palawan, Borneo (Mt.
Kinabalu, etc.), Sumatra, Moluccas (Seram), Lesser Sunda Isl. (Bali, Lombok,
Sumbawa, Flores, Timor, Alor), Sulawesi, Solomon Isl. (Guadalcanal, Santa
Ysabel, Kolombangara, Makira, Malaita, Kirakira), Bismarck Arch. (New Ireland),
Australia (NE-Queensland), Western Samoa (Aleipata Isl., Savaii, Upolu),
American Samoa (Tutuila, Ofu, Ta’u), Fiji (Viti Levu, Vanua Levu, Batiki, Gau,
Koro, Ovalau, Taveuni), Rotuma Isl., Southern Marianas (Guam, Rota Isl.),
Northern Marianas (Pagan, Anatahan, Alamagan, Maug, Asuncion, Agrigan, Sarigan),
Palau Isl., Micronesia (Yap, Truk, Moen, Dublon, Tol, Pohnpei, Kosrae), Tonga
(Late Isl., ‘Eua, Vava’u, Niuafo’ou, Tafahi), Madagascar, Comoros (Anjouan,
Grande Comore, Mayotte)
as per Catalogue of Life;

 

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Fern of Ajibarang Limestone 1: A kind of fern with long pinna. ID is needed. Loc. Ajibarang limestone mountain ca 300 m alt.


It looks like Pteris quadriauriata or P. assamica


Pteris quadriaurita is endemic to Sri Lanka and S. India and has narrower pinnules with crenations below the apicule. P. assamica has shorter or sometimes no basal accessory pinnules than this plant – and while it might be in Java, I have seen no material of it further South-East than Malaya.
But P. biaurita subsp. fornicata is common in Java and looks like this.


 

Mahabaleshwar, MH :: Fern for ID :: ARK2020-080 : 7 posts by 2 authors. Attachments (5)

Seen this fern in Mahabaleshwar, MH in March 2020.
Requested to please ID.


It is a Pteris of the P. biaurita group (where the bases of the ultimate segments are quite widely joined, so that the inter-pinnular sinus is quite a bit above the pinna-costa).
I have tried hard to see the venation between the segment-bases – as it is essential in this group.  Photo 1 – I think? – seems to show that there is a narrow areole all along next to the costa, with veins arising from it and passing up to the sinus. If that is so then it is P. biaurita subsp. fornicata.
    If it is possible to get the herbarium-specimen and make a close-up photo of the bases of a couple of segments against the light, we could then see the identity for sure.
    Could you do that and repost it?  Or otherwise can you send me a higher-resolution image of photo 1, so I can magnify it enough to see those essential veins?


Thanks … for your feedback.
I am uploading the original pic. Hope this can help.


Well it’s pretty much the same – by the time it reaches me it goes out of focus when one magnifies it enough to see the venation.  But you have a look and see if you can see what I think I am seeing – a very narrow areole formed by the anastomosing basal veinlets, the areole running along the pinna-costa?  Is that right?  So I thinkit’s  just P. biaurita subsp. fornicata, which is a triploid-apomictic subspecies of P. biaurita – a very common and widespread species.


 

 
References:
116
2008 ;
 
 
 
;
 
 

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