Diplazium dilatatum SN15420a

[Ponnutheerthagiri Santhan]

Diplazium dilatatum Terrestrial wild fern from Western Ghats Tamilnadu. It is our old collection 34 years old. Sori with oblique orientation. Fronds bipinnately lobed.

[J.M. Garg]

Thanks, Santhan ji.

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[J.M. Garg]

Thanks a lot, Chris ji

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With regards,
J. M. Garg

---------- Forwarded message ---------
From: Chris Fraser-Jenkins <>
Date: Wed 15 Apr, 2020, 6:39 PM
Subject: Not Diplazium dilatatum!
To: J.M. Garg <jmg...@gmail.com>

No, that's not D. dilatatum, but D. latifolium.  I think your identification references are a little out of date!  Reports of D. dilatatum from South India are misidentifications for D. latifolium, which latter occurs in both the N.E. and south of India.  I have not yet seen any correct collections of D. dilatatum from South India in any herbarium, or from my own collections, though I've seen many misidentifications as it.  As I published in Indian Checklist 2, it is almost certainly absent from South India.

    Note the long, long sori, and the rather separate rectangular lobes of the pinnae - of D. latifolium, and texture of lamina more succulent..

   However, the specimen is not a good example - as for all Diplazium we need to see the scales at the stipe-base.  If this is not carefully preserved on the sheet (without rubbing the scales off), the specimen is inadequate  - and may be unidentifiable in the case of other more difficult species of Diplazium and some other genera.

    D. dilatatum has  many very narrow, almost fibril-like, brown scales running up from the stipe-base to half-way up the stipe, getting smaller and almost absent further up the stipe.   But D. latifolium has few, short, broad, very black, crinkly scales confined to the stipe-base, the stipe-base usually being papillate at the very base, which is more easily visible in living plants.

    Both have very thick ascendent rhizomes, but both can give rise to thin, long-creeping runners with small plants with less dissect, but sometimes fertile fronds at their apices - especially in D. dilatata. 

Chris Fraser-Jenkins.