Through the kindness of various mycologists, it is possible to report on species of Taphrina from western North America as follows: A new species, Taphrina Amelanchieri, causes witches' brooms on Amelanchier alnofolia Nutt. Another new species, Taphrina Boycei, causes leaf-spots on Betula fontinalis Sarg. and B. occidentalis Hook. Taphrina Pruni-subcordatae (Zeller) Mix attacks shoots of Prunus subcordata Benth. It is possible that this fungus is biologically distinct from the form causing fruit-pockets on the same host. A new species, Taphrina flectans, causes witches' brooms on Prunus emarginata Walp. The fungus causing leaf-curl of Prunus demissa (Nutt.) Walp., assigned by Atkinson to Taphrina varia is held to be Taphrina unilateralis (Peck) Mix. (T. varia is shown to be synonymous with T. Farlowii Sadeb.) Fungi deforming catkins of Alnus rhombifolia Nutt., A. rubra Bong., and A. tenuifolia Nutt. are considered variants of Taphrina Robinsoniana Giesenhag. A leaf-curl of Alnus rubra Bong. is caused by an unidentified species of Taphrina showing resemblances to T. japonica Kusano and T Alni-japonicae Nishida. Taphrina aurea Fr., besides being well distributed on Populus Fremontii S. Wats., and on P. trichocarpa Torr. and Gray, occurs on a new host, Salix laevigata Bebb. Fungi found in new localities are: Taphrina californica Mix on Dryopteris arguta (Kaulf.) Wats., and T. Faulliana Mix on Polystichum munitum (Kaulf.) Presl.
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