Quercus helferiana

Quercus helferiana A.DC., Prodr. 16(2): 101 1864. (syn: Cyclobalanopsis helferiana (A.DC.) Oerst.; Quercus ilex Lour., nom. illeg.; Quercus prainiana H.Lév.);
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Assam to S. China: Assam, China South-Central, China Southeast, Hainan, Laos, Myanmar, Thailand, Vietnam as per POWO;
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MS,Nov.,2021/65 Quercus sp. for id: 3 images.
Location : Dungtlang, Mizoram
Date : 21-11-2021
Habit : Medium-sized tree
Habitat : Wild

Quercus sp.
1 very high res. image

I think it is Quercus helferiana

But, it is not similar with my MS, Dec.,2020/19 Quercus sp. which already identified as Quercus helferiana.

Size of acorn of this tree is about 2.5 cm across. And size of acorn of MS,Dec.,2021/19 Quercus sp. for id is about 1.1 cm in diameter.

Keys pl.

Yes, looks somewhat different from your earlier post at MS, Dec., 2020/19 Quercus sp. for id
Also I could not find a match as per comparative images at Quercus.
Keys pl.

I think it looks close to Quercus lineata as per GBIF specimens from India: one, two
I think it looks different from Quercus semiserrata as per POWO specimens- one, two

It’s not Quercus lineata

Why do you say so?

It is not similar with Mizoram Quercus lineata

To me appears close.

I have doubts about this tree, It seems Quercus helferiana as per the Flora of the Lushai Hills, and it is also very similar with photos taken by Hoang Son in Oaks of the world.

Quercus helferiana leaves are tomentose beneath, which is not the case here.
I will go be Quercus lineata only.

Now I feel it may be more likely to be Quercus helferiana as per Oaks of the world and keys at MS,Nov.,2021/65 Quercus sp. for id

Yes, I agree.

MS,July,2022/01 Quercus sp. for id: 4 images.
Location : Dungtlang, Mizoram