Aglaonema costatum

Images by Gurcharan Singh (inserted by Bhagyashri Ranade)

Aglaonema brevispathum (Engl.) Engl.
Photographed from Delhi University Flower Show, please validate
I do not know.... yet it does look similar to -
i) cataphyll subtending petiole usually drying-persistent; petiole usually equaling or exceeding blade; leaf-base usually obtuse to subrounded - brevispathum
ii) cataphyll subtending petiole usually immediately deliquescent; petiole usually less than blade length; leaf-base subcordate to rounded - costatum
There is an image titled Aglaonema costatum 'First Diamond' (parent directory - which seems replica of the first pic in this thread. But, who knows if the author is correct or not!
May be you are right ... Thanks for keen investigation.
Id of a plant : 8 posts by 3 authors. Attachments (1)- 5 Mb. 
Request for identification of an ornamental from Mahe. Photographed in November, 2019.
Pl. check 

Aglaonema sps for sure. Could be a variety of A.costatum sps.  Very difficult to pin point the variety in this group.
Thank you very much ... I also felt that it could be A. costatum.
Thanks, ..., for the id.
I could find similar images at
Some sites call it Aglaonema costatum 'F. Foxii'