A text-book of mycology and plant pathology . Pig. 53.— Mildew of chestnut leaves due to Phyllaclinia corylei with ascus andperithecium to left. (Martic Forge, Pa., Nov. 2, 1915-) MILDEWS AND RELATED FUNGI 157 sphcera (Fig. 54) dichotoniously branched. These appendages prob-ably assist in the distribution of the perithecium, serving to attachthe perithecia to plants, if wind-l)orne, or to the bodies of insects bywhich they are carried to other plants. The number of asci found in aperithecium and the number and character of the spores in the ascivary generically (see Appendix VIII, pages 721-72
A text-book of mycology and plant pathology . Pig. 53.— Mildew of chestnut leaves due to Phyllaclinia corylei with ascus andperithecium to left. (Martic Forge, Pa., Nov. 2, 1915-) MILDEWS AND RELATED FUNGI 157 sphcera (Fig. 54) dichotoniously branched. These appendages prob-ably assist in the distribution of the perithecium, serving to attachthe perithecia to plants, if wind-l)orne, or to the bodies of insects bywhich they are carried to other plants. The number of asci found in aperithecium and the number and character of the spores in the ascivary generically (see Appendix VIII, pages 721-726). As the fungi of this family are especially suitable for systematicstudy, a key is given not only of the principal genera, but also of the anth^ at^^. Fig. 54.—Lilac mildew, Microsphara alni. A, Perithecium with appendages;B, perithecia showing asci {a); C. ascus with ascospores; D, conidiophore (cph),bearing conidiospores (); E, beginning of fertilization; anth, antheridium; car,carpogonium; F, later stage of fertilization showing the fusion of two nuclei (/).{From Gager with E and F after R. A. Harper.) principal species of the different genera. These keys (p. 721) have beentaken from a monograph of the Erysiphace^ by Ernest S. Salmon, pub-lished in 1900, as vol. ix of the Memoirs of the Torrey Botanical Club, towhich the mycologic student is referred for detailed descriptions of thevarious species. The material for the systematic study is easily keptin the dry condition and the perithecium can be studied in situ on thedried leaf or other plant parts, and later treated with weak alcohol 158 MYCOLOGY to remove the air, washed and mounted permanently stained, orunstained in acetic acid with a ring of asphalt, or in glycerine j
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