NOTES ON THE ERYSIPHACEAE 209 
Explanation of Plates 
(All figures, unless otherwise stated, are magnified 400 times) 
PLATE 9 
Fic. 1. Conidial stage of Erysiphe polygoni DC. on Anthriscus sylvestris, from 
Reigate, England, Sept. 1900 ; conidiophore bearing a single conidium, and conidia. 
Fic. 2. Conidial stage of EZ. polygoni DC. on Heracleum sphondylium, from 
Reigate, Englund, Oct. 1900, two conidiophores, each bearing a single conidium 
and conidia. 
Fics. 3-6. Microsphaera euonymi (DC. ) Sacc. on Caragana Jrutescens, from Rus- 
sia (in herb. Jaczewski); 3-5, apex of three appendages of the perithecium; 6, ascus 
and ripe ascospores. 
Fic. 7. Conidia of £, polygont DC. on Sisymbrium Alliaria, from Kew, Eng- 
land, Oct. 1900. 
Fic, 8.. Conidial stage of Z. polygoni DC. on Delphinium hybridum, from Kew, 
England, Sept. 1900 ; two conidiophores, each bearing a single conidium, and conidia. 
Fic. 9. Germinating conidium of £. polygoni DC. on Delphinium hybridum in 
8 drop of water, showing the formation of an appressorium at the point where the germ- 
tube came in contact with the cover-glass. 
FIG. 10. Apex of an appendage of the perithecium of ‘‘Microsphaera Myoschili 
Neger”’ (=. alni (Wallr.)) on MMyoschilos oblongum, from the Andes, Argentine 
Republic (ex herb. Neger. ) 
Fic. 11; Apex of an appendage of the perithecium of J/. a/ni (Wallr.), on 
Rhamnus cathartica, from Brandenburg, Germany (Rehm. Ascomycet. no. II17). 
Fic. 12. Ascus and ripe ascospores of ‘‘ E ysiphe Fricki Neger’’ (= £. poly- 
gent DC.), on Geum Chiloénse, from the Argentine Republic (ex. herb. Neger). 
Fic. 13. Lobed haustoria of £. galeopsidis DC. on Tagetes minuta, from Lin- 
coln, Argentine Republic (ex. herb. Spegazzini), x 670. 
Fics. 14,15. Tri- and tetrasporous asci of Phydlactinia corylea (Pers.) Karst., 
on Fraxinus Ornus, from Saxony (Rabenh. Fung. eur. no, 1056). 
Fics. 16, 17, Apex of two (partly immature) appendages of Microsphaera alnit 
(Wallr.) on Berderis vulgaris, from Russia (Jacz. Kom, Tranz. Fung. ross. exsicc. no. 
337 b., sub Az berberidis). 
PLATE 10 
Penicillate cells of the perithecium of Phy/lactinia corylea ( Pers.) Karst., from 
examples from different parts of the world. 
Fics. 1-6, «Pp. clavariaeformis Neger,’’ on Embothrium coccineum, from the 
Argentine Republic (ex herb, Neger); 6, ascus and ripe ascospores of same. 
Fics, 7-9. «Pp. Antarctica Speg.,”’ on Ribes Magellanicum, from Lion Range, 
tr. Gregory Bay, Patagonia (ex herb. Spegazzini). : 
Figs. 10-12. P. Antarctica Speg.,”’ on Ribes Magellanicum, from Patagonia (ex 
herb. Dr. Rehm). 
Fic. 13. On Adesmia sp., from the Argentine Republic (ex herb. Spegazzini ). 
Pies. 14-15. On. Excoecaria sp., from Paraguay (ex herb. Spegazzini). 
Fics. 16-18. On Alnus serrulata, from South Carolina, U. S. A. (Rav. Fung. 
amer. exsicc. no, 624, in herb. Kew). 
Fic. 19. On Carpinus Americana, from Mlinois, U. S. A. (Herb. Kew). 
