Hawaiian Forest Fungi. IV. Rusts on Endemic Acacia Species

Abstract
Uromyces digitatus, U. koae, ENDORAECIUM acaciae gen. et sp. nov. and E. hawaiiense sp. nov. occur on endemic Acacia spp. in Hawaii. Endoraecium is a new genus erected to accommodate endocyclic species with pedicellate aecial teliospores. U. koae, the only rust species previously reported from Acacia spp. in Hawaii, is demicyclic instead of macrocyclic as formerly believed. U. digitatus, originally described from Australia as a demicyclic species, is macrocyclic in Hawaii. A microcyclic form of this species with teliospores indistinguishable from the macrocyclic form, also occurs in Hawaii. The symptomatology, biology and host ranges of these rusts are described, and their possible taxonomic relationships are discussed.

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