Aspergillus sp. and suitable media

Please forgive my ingnorance about Aspergillus. It would be appreciated if anybody help me with the following problems:
I have isolated an Aspergillus species from sorghum ergot infected heads, which produces white greenish colonies on PDA. It also produces yellowish metabolites in PDA and Potato Dextrose Broth. In PD Broth it also produces pellets. Now my questions are
1. What is the probable name of the species
2. What is the name of yellowish metabolite produced
3. What medium/media suitable for maximum spore production of Aspergillus
Name of reference books/journals are appreciated.
Regards
S.A. Bhuiyan
School of Land and Food
The University of Queensland
Queensland, Australia