Probably you should also consider the genus Apeiba (Malvaceae, Grewioideae). Especially Apeiba membranacea looks similar - see http://www.acguanacaste.ac.cr/paginas_especie/magnoliophyta/tiliaceae/apeiba_membranacea/a_membranacea30jun98/a_membranacea30jun98.html

It looks like Artocarpus altilis

If the fruit is hard, It could be a Durio sp. If it's soft, it could effectivelly be an Artocarpus.

Many thanks for the suggestions, but neither Durio sp, nor Artocarpus fits. The fruit is a dry flat disc with 6 cm in diameter and 2 cm high. On its back side is an opening. An other fruit has two holes on the top of the disc.  Many small seeds are in this capcule.

The surface reminds me of fruits of Guazuma, although the shape doesn't fit.  I'd look in Malvaceae s.l.

I am almost sure that is a Pandanus compound fruit

Finally, I think it resembles the fruit of species Liquidambar. Even if their fruits have round shape, the size of fruit and seeds is compatible. Your fruit may come from a relative.

I disagree. Liquidambar styraciflua has globular fruits. Te fruit surface in the photo is similar to Platanus acerifolia, but Platanus fruits are globular too, not flattened.

I know this (and told it "resembles" despite their "round shape") that's why I didn't propose directly a Liquidambar and said it could be a relative. May be a tree from the Hamamelidaceae family. It seems to be a lot of candidates but I hope it's closer than the Artocarpus I proposed few days ago.

If the fruit is imported as ornamental and known in trade in dried form only, maybe someone flattens it before (or while) drying?

If the fruit is so small  and dried , u cant germinate it because it might have been young and dried  so seeds will not germinate,  

Probably you should also consider the genus Apeiba (Malvaceae, Grewioideae). Especially Apeiba membranacea looks similar - see http://www.acguanacaste.ac.cr/paginas_especie/magnoliophyta/tiliaceae/apeiba_membranacea/a_membranacea30jun98/a_membranacea30jun98.html

I think we have found the winner :)

Dear Franz Starlinger,

Thank you very much for your suggestion. I have checked all available pictures and materials about the Apeiba membranacea fuit and they fit to your suggestion!

I agree, you gave the correct answer, thank you very much!

Best greetings,

Bela Böddi

So, Apeiba seems to be clear, but in my opinion any other species of sect. Petoumo (see http://www.fieldmuseum.org/blog/notes-apeiba-malvaceae ) cannot be excluded. I have found a scan of a fruiting herbarium specimen of A. petoumo that also looks similar - see http://sonneratphoto.mnhn.fr/2012/07/23/9/P06644394.jpg  I am not sure, if an identificatio at species level is possible. Have to try Flora of the Venezuelan Guayana.

Best wishes,

Franz Starlinger

The fruit, really is an infrutescense. In Mexico Platanus genus has these structure in female trees.

The common name is sycamore, sicomoro, plane tree, álamo de río.

Marco Antonio Guzmán Lucio

Autonomous university of Nuevo León

México

The depicted fruit is of Apeiba membranacea Spruce ex. Benth.  which belongs to  Malvaceae family.

Durio zibethinus or Apeiba membranacea are similar.