Some Plant Galls of Illinois volume 12

Cover Some Plant Galls of Illinois volume 12
Some Plant Galls of Illinois volume 12
Glen Spelman Winterringer
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Wool Sower Gall Gall Wasp (Callirhytis seminator Harris) White Oak (Quercus alba L. ) A showy and attractive gall growth on oak twigs. The large number of small, hairy galls are attached to a common point to form this pinkish-white, wooly growth. A gall with a similar appearance may be found on several other species of oak. The Wool Sower was called by E. P. Felt ". . . One of the finest of natural objects. " (CH) Fig. 10 (below). Oak Hedgehog Gall Gall Wasp {Acraspis erinacei Beutm. ) White Oa...k {Quercus alba L. ) Oak leaf galls are often observed since species of oak are favorite hosts of gall wasps. The Acraspis Galls are complicated because of the sexual and agamic forms (See Fig. 3 and discussion of alternation of generations). These reddish-green Hedgehog Galls are the agamic form and may be spiny or nearly smooth. (CH) 18 Fig. 11 (above). Oak Potato Gall Gall Wasp (Callirhytis seminosa Bass. ) Pin Oak (Quercus palustris Muench. ) Hard, woody knots mark the appearance of this gall on twigs of pin oak, and they are sometimes described as resembling a strawberry.

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