Christella dentata (Forsk.) Brownsey & Jermy, Brit. Fern Gaz. 10(6): 338 1973. (syn: Aspidium aquapimense Schumach.; Aspidium hilsenbergii Sieb.; Aspidium molle Sw.; Aspidium natalense Fée; Aspidium nymphale (G. Forst.) Schkuhr; Aspidium violascens Link; Christella dentata var. caespitosa Holtt.; Christella dentata var. himalayensis Punetha & Kholia; Christella hilsenbergii (C. Presl) Holtt.; Christella malabariensis (Fée) Holtt.; Christella multiauriculata Punetha; Christella nymphalis (G. Forst.) Pichi-Serm.; Christella taprobanica (Panigrahi) Holtt.; Cyclosorus caespitosus (Holttum) Mazumdar & Mukhop.; Cyclosorus dentatus (Forsk.) R. C. Ching; Cyclosorus dentatus f. bipinnata Ching; Cyclosorus dentatus var. violascens (Link) Abbiatti; Cyclosorus dicarpus (Fée) Ching; Cyclosorus fengii Ching ex Shing; Cyclosorus hispidulus A. Peter; Cyclosorus jiulungshanensis P. S. Chiu & Yao ex Ching; Cyclosorus lanpingensis Ching; Cyclosorus lungmenensis Ching; Cyclosorus lushiensis Ching; Cyclosorus mekongensis Ching (ambiguous synonym);  Cyclosorus mekongensis Ching ex Shing (ambiguous synonym); ………………………..; Thelypteris dentata (Forsk.) E.St. John ; ………………………);
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PR 23-04-11 For ID. A fern.Chennai.: Please help me id this lovely fern which I picked up from a roadside ditch
in Bangalore. Surprisingly enough it seems to be thriving in our climate at Chennai. The last two pics show the under-surface.


– If I had to guess, I would have gone for Christella dentata, but please check if the sorus are covered with indusium (a white covering onver the black spots.)


– I also think Cyclosorus dentatus (Forssk.) Ching, synonym Christella dentata.


Christella dentata , morphology may will differ considerably in relation with soil and light


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please help me in the identification of ferns photographed at Eastren ghats.


Thelypteris (Sect. Cyclosorus) probably meeboldii or otherwise dentata. Necessary diagnostic features not shown in these photos:
1. Rhizome thin and long-creeping – meeboldii; or thick, shorter creeping – dentata.
2. Lamina-base wide – T. parasitica, or tapering – dentata and meeboldii.

3. venation to be seen – how many pairs of opposite veinlets anastomose beneath the inter-segmental sinus? Two or more – meeboldii; 1 and a half – dentata; 1 – parasitica.


Thank you very much …,
the rhizome is thick, may be T.dentata.


OK, yes, sounds like it – then usually 1 and a half pairs of veins anastomose below the sinus, less than in meeboldii. And T. dentata is slightly more hairy beneath than the almost glabrous (to the naked eye) T. meeboldii.


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Fern ID requested : 8 posts by 3 authors. Attachments (1).

I had noticed this fern emerging out of the wall of a large drain in NIT Durgapur.


Is it Cyclosorus?


Is it Dryopteris odontoloma??


Thelypteris (Sect. Cyclosorus) dentata, probably the commonest and most widespread fern in India.

Has an interesting insect lying on it.


Thanks a lot. It is not an insect. It is the exuvia of the Green Marsh Hawk Dragonfly.


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What fern?/ABDEC12 : 5 posts by 3 authors. Attachments (6)

I took a frond of this large fern (90cm) home yesterday. After poring over Dr Khullar’s books ( I did get them finally) for a couple of hours in the evening, I shortlisted four possible candidates.

Deparia boryana
Christella dentata
Cyclogramma auriculata
Dryopteris nigropaleacea
More online poking about made me doubt the last two possibilities. I do not know how I can go any further. Please advise.
I took the first picture today on my phone. All others were taken last night under artificial light. I adjust the colour temperature in post processing to represent the colours as faithfully as possible.
Mcleodganj, Dharamshala, HP
1750m
A few ID points;
1. The stalk which is claret (more brown than red) with coppery sheen has a channel running though it. It gets paler as we approach the tip of the frond. The second picture taken higher up on the same frond shows the stipe to be almost green with white hair (scales) but the channel is still visible.
2. The bottom four pairs of pinnae are small and curling, gradually increasing in size. The maximum pinna length (about 9cm in my sample) is reached somewhere in the middle of the frond.
3. Sori are round and brown running along the edges of the pinnules. I counted between 7 and 10 on per pinnule (except where there are none) of this sample.

I’m very pleased to see you got it right down to two choices. This is great news, and a fine achievement.  It is Thlypteris (Sect. Cyclosorus = Christella) dentata. You will see one and a half pairs of veinlets anastomose between each lobe, and rhizome horizontal.

Cheers – and keep up the good work,

Thank you … for your help and for your encouraging words. I will find another sample with the rhizome soon and observe the veinlets closely.



This was in winters and now these Thelypteris dentata ferns are maturing with white horse-shoe sori developing. Here are a few fresh images from today.

4 images.


Absolutely fantastic photography


Thank you …


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Thelypteris parasitica SN17420b : 3 posts by 2 authors. Attachments (1) – 4 mb.

Thelypteris parasitica (L.) Tardieu (=Christella parasitica)
Wild fern from Western Ghats Tamilnadu.

I think it is much more likely to be T. (sect. Christella) denatata – but the photo is inadequate to show which, but it is not typical for T. parasitica at all.
1. I need to know if the rhizome was rather thinnish, long-creeping (parasitica), or thick and rather short-ish creeping (dentata). The rhizome condition is very important in Thelypteris.
2. The BOTTOM pinnae are always the most important – but are not pressed properly and are mostly out of the picture. In paratsitica they are longer and so is the lowests acroscopic pinna=lobe.
3. I need to see the venation against the light, close-up – 1 pair anastomosing = parasitica, one and a half anastomosing = dentata.

4. I need to see the hairs on the lower surface of a pinna. These look too sparse and short for parasitica. But it needs a close-up photo to show them.


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Fern id please
1 image.
Taken in the month of Feb in Talakona forests, AP on the way to the waterfalls.


Christella normalis?


For nearly all ferns one must see the frond-base, not just upper halves as in so many field photos.  It is one of the reasons why a herbarium-specimen photo is often better.  For Thelypteris species, one also needs to know how the rhizome was, thick-erect with fronds together; thick horizontal, fronds together at apex; or thin long-creeping with fronds separate.  This I can’t see in the photo.
However, I can just see the decreasing basal pinnae in one of the central fronds.  Enough to confirm the general impression that it is Thelypteris (Christella) dentata.
If so, it should have a horizontal, thickish rhizome, with fronds together at one end; the basal pair or two pairs of veinlets between each pinna-lobe should anastomose beneath the sinus between lobes and the lower-surface of the costa should have rather obvious scattered stiff hairs, not very long.
But in south India T. dentata is obviously a complex and there seems to be another taxon, close to T. dentata, but with a thin, long-creeping rhizome with more separate fronds arising along it, and the costal hairs are shorter – and more usually two or two-and-a-half pairs of veinlets anastomosing. I think this is T. (Christella) meeboldii – and I collected it in the Shevaroys, Palnis and Kerala, and have seen it from Andhra.  Dr. Sledge found that his Sri Lankan T. meeboldi had spinulose-ridged spores, unlike T. dentata, but if I understood the type correctly (no rhizome – of course!!) it seems to be the long, thin rhizome species.  And some seem to have spinulose spores some not.  See page 453 of my Annotated Checklist of Indian Pteridophytes vol. 1 (2016).  That long-rhizomed thing is only in South India, not the north.  But I just can’t be sure yet if it is meeboldii or not!  My living plant from Kerala soon died unfortunately, so I only grew it for about  a year. It is a different species from T. dentata anyway.

Perhaps you could tell me what the rhizome was like and we could make a more informed judgement?  In general I think your plant looks to be normal T. dentata.


 

 

 


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References: Catalogue of Life  Flora of North America  The Plant List Ver.1.1 (Thelypteris dentata (Forssk.) E.P. St. John is a synonym of Christella dentata (Forssk.) Brownsey & Jermy)

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