Species of the genus Phragmidium (Pucciniales) as parasites of roses (Rosa, Rosaceae) in Ukraine

Abstract

Four species of the genus Phragmidium parasitizing plants of the genus Rosa (Rosaceae) are recorded in Ukraine. Phragmidium fusiforme occurs only in the Carpathians. Phragmidium rosae-pimpinellifoliae was reported only from the Crimean Peninsula. Phragmidium mucronatum and P. tuberculatum are distributed much more widely and occur in Ukraine much more frequently. A reliable feature for distinguishing these two species is a character of the upper cell and papilla of teliospores: in P. mucronatum it attenuates gradually toward the apex to form a papilla, while in P. tuberculatum the papilla is clearly delimited from the rounded apex of the upper cell of the teliospore. An interesting feature of all three species illustrated in this article but not reported previously in mycological literature is a twisting of the upper part of the pedicel of their teliospores. The article is illustrated with photomicrographs obtained using a scanning electron microscope.