Salix lasiolepis gall Pontania californica

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Description: Gall on Arroyo willow (Salix lasiolepis) induced by a sawfly (Pontania californica syn. Pontania pacifica). Glen Canyon Park San Francisco, CA _________________ Reference: Field Guide to PLANT GALLS of California and Other Western States by Ron Russo- ISBN 978-0-520-24886-1. Date: 26 November 2007, 18:03. Source: Willow Apple Gall in Glen Canyon Park Uploaded by pixeltoo. Author: Franco Folini from San Francisco, USA. Camera location37° 44′ 18.1″ N, 122° 26′ 29.67″ W View all coordinates using: OpenStreetMap 37.738361; -122.441575.