Note the bud with a twisted top between the leaves. Beccari's collections are in Florence, where is 'his' museum. Most authors regard this name as a synonym of C. lingua . There are some well known localities, see f.e. Horst and Schulze.
Cryptocoryne lingua grows in Sarawak, Borneo.
The plant has a striking resemblance in the vegetative parts to C. versteegii , the latter however originates from New Guinea. Nevertheless it would be interesting to see the variation in C. lingua . Reports on cultivation are very diverse. Most growers report that C. lingua is difficult to grow on the long term. But for example, Munich Botanical Gardens maintains a container of one square meter, full with C. lingua , for years.