Pollen germination and pollen tube growth were studied by fluorescence technique in pistil ofCrocus sativusand C.thomasiiafter intra- and interspecific pollinations. The results indicated thatC. sativuspollen germinates in low percentage in all the stigmas and some pollen tubes grow down to the ovules. In both theCrocusspecies the pollen tube growth is accompanied by anormalities of pollen tube behaviour and its tip aspect. Since most of these abnormalities are found in all the pistil parts it was not possible to correlate them with incompatibility in the studied plants.