. Fig. 57.—E.coasciis cerasi on Prunus C'erasiu. Clicrry-treo in blossom, with the exception of four witches' brooms. The tree is as yet leafless except the brooms, which are in full foliage and show up dark. (v. Tubeuf phot.) Exoascus carpini Eostr. is common on Carpinus Betukts (horn- beam) (Fig. 55). The brooms produced are bushy and densely leafed; the twigs are thickened and much branched; the leaves