TWENTY-SEVENTH ANNUAL MEETING. ' 203 



nae parte crescit." If the specific name used by Linnaeus (Mucor erysiphe) 

 be tali;en up, it should probably be applied to the mildew of the hop, as that 

 plant is the first host mentioned under that species (L. Spec. PI. 1186 (1753). 



PODOSPHAERA Kunze Mycol. Hefte II, p. Ill (1823). "Perithecium sub- 

 globosum; processubus radiculiformibus horizontalibus excentricis, apice 

 in laminan dilatato radicantibus. Ascus solitarus, thecis ovalibus sporidi- 

 geris octo repletus." 



P. oxycanthae (DC.) "D'By. Morph. und Phys. der Pilze III, p. 48." Ery- 

 siphe oxycanthae DC. Flore Franc. VI, p. 106. "On trouve cette erysiphe sur 

 les deux surfaces des feuilles de I'aubepine: elle ressemble a celle de I'ancolie 

 par sa maniere de croitre, c'est-a-dire, que ses tubercules sont noirs, epars, 

 tres-ecartes, et ne forment pas, par leur entre croisement, une croute visible; 

 la seule circonstance qui puisse falre distinguer cette espece, est I'extreme 

 brievete des filamens blancs qui sortent de ses tubercules. M. Cauvin me I'a 

 envoyee des environs d'Angers, et M. Chaillet, de Neufchatel. Je I'ai trouvee 

 en Bretagne. M. Bosc me I'a fait observer en grande abondance sur les 

 plants d'aubepine des pepinieres de Versailles; il observe que cette parasite 

 retarde sensiblement lur croissance." Amphigenous, mycelium scant or 

 abundant, persistent. Perithecia 65-110 mmm, dark, opaque, appendages some- 

 times septate, 1-4 times, diameter of the perithecium, 3-5 times dichotomous, 

 branches short, tips recurved, ascus broadly elliptical or orbicular, sporidia 

 usually 8. On cult, plums, leaves of cult, cherry. 



MICROSPHAERA Lev. Ann. Sci. Nat. Ser. Ill, Tome XV, p. 381 (1851). 

 This is under list of corrections to the body of the work (pp. 109-179). He 

 substitutes Microsphaera for Colocladia, hence all the Colocladiae become 

 Microsphaeriae Colocladia, Lev. 1. c. 46 [154] (1851). "Mycelium arachnoideum 

 subcontextum evanidum vel persistens conceptacula sporangiis 4-8, ovatis, 

 rostratis, 4-8 sporis repleta. Appendiculae rectae dichotomae, ramulis apice 

 turgidis vel filiformibus." 



M. grossularia (Wallr.) Lev. Ann. Sci. Nat. Ser. Ill, T. XV, p. 160 (1851). 

 "Alphitomorpha penicillata var. Grossulariae, Wallr. Verb. Naturf. Freunde 

 I, p. 40." The following is from Lev. 1. c. : "Bifrons. Mycelio arachnoideo 

 fugaci vel persistente. Conceptaculis sparsis vel gregariis giobosis minutis 

 Sporangiis 4-8 ovato-rostratis 4-5 sporis. Appendiculis 10-15 vage dichotomis, 

 ramulis ultimis bidentatis." On Sambucus Canadensis L. 



M. symphoricarpi, Howe Bull. Torr. Bot. Club, V, p. 3. "Mycelium effused, 

 subpersistent, conceptacles scattered or crowded; appendages 8-16, 2-4 times 

 the length of the diameter of the conceptacles, 3-5 times dichotomous, ramuli 

 divaricate, tips variable, often truncate, never curved, sporangia 4-6 with 3-5 

 spores. Leaves of Symphoricarpus. Nov." On Symphoricavpus sympho- 

 ricarpus (L.) MacM. 



M. euphorbiae (Peck) B & C. Grev. IV, p. 160 (1875). 26th Rep. N. Y. 

 State Mus., p. 80. "Mycelium thin; conceptacles small, .0035 in. in diameter; 

 appendages few, long, flexuous, colored; sporangia broadly ovate, 3-4; spores 

 3-4, large, .001 x .00065 in " Long tips often trifld or 4-6 x dichotomous, asci 

 pedicillate, sporidia 4-6. On Euphorbia corollata L., E. marginata Pursh. 



M. alni (Lam. and DC.) Winter Die Pilze II, p. 38 (1892). Erysiphe alni 

 Lam. & DC. Syn. PI. Gall. 57 (1806). "Hypophylla, filamentis plurimis ex- 

 pansis longissimis liberis — Sclerotium erysiphe alnea. Schl. cerat. exs. n. 68. 

 In Alno incana. Perithecia 80-100 mmm, abundant, appendages 1-2 times di7 

 ameter of perithecia. 3-4 times dichotomous branched, tips strongly recurved. 

 Asci orbicular, sporidia usually eight, variable. On Platanus occidentalis L. 



