Ravenelia species were found in legume plants (family Fabaceae) in Thailand.
Ravenelia stevensii occurred on Pterolobium macropterumin Lampang and Khonkean
provinces, and Ravenelia neocaledoniensis on Vachellia farnesiana in NakhonPathom
province. They produced different sporulation stages and spore morphology on their
hosts.Ravenelia stevensii produced spore stages including spermogonial, aecial, uredinial and
telial stages in the same host (P. marcopterum). Ravenelia stevensii have prominently
appendages on teliospore surface and its structure size was very closely to voucher
specimens.The rust fungus, R. neocaledoniensis was found only uredinial stage on V.
farnesiana. The species were identified confirmation bymorphology and phylogenetic analysis
using 28S rDNA. The results showed that R. neocaledoniensis was grouped together with the
sequence obtained from GenBank database. The four squences of R. stevensii were clustered
and separated from others Ravenelia species with 100% bootstrap value supporting. These
rustfungi and host taxa were reported as a new record not only in Thailand but also in Southeast
Asia.