Deuteromycetse, Mucedinacese, Oidium. 1249 



draceis utrinque truncatis 5-10 ^ 2,6 eguttulatis, levibus, dense ra- 

 mulose catenulatis, liyalinis. 



Hdb. ad Coccos emortuos in foliis Cycadis revolutaein 

 Horto botanico Sao Paulo Brasilia (Usteri). — Species formte 

 phytogenne G. candidi Lk. simillima, conidiis tamen majoribus di- 

 stincta. 



OIDIUM Link — Syll. IV p. 40, X p. 520, XIY p. 1041, XVI 

 p. 1025, XVIII p. 605. 



1. Oidium Clematidis (Chittend.) Sacc. et Trav. — Syll. XX, p. 212 7941 

 — Ovularia Clematidis Chittenden, Gard. Chron. (1903) p. 299, 

 Cooke Fung. Pests p. 20, fig. 4, Salmon in Journ. of Bot. j'1905) 

 pag. 42, t. 469, f. 2. — Ctespitulis epipetalis, albis, conspicuis, 

 subcircularibus, 2-4 cm. lat. ; hyphis sterilibus repentibus, hyali- 

 nis, ramosis; conidiophoris erectis, simplicibus 40-60*7, bi-trise- 

 ptatis, apice in conidia breviter catenulata v. solitaria, cylindracea, 

 utrinque rotundata, 28-42 >^ 14-16, levia abeuntibus. 



Rdb. in pag. sup. petalorum Clematidis sp. prob. Clem. 

 Jackmanni, Chelmsford Britannia. — Ex icone evidentissime 

 Oidii species. 



2. Oidium Crataegi Grogn. in Eoum. F. gall. n. 881, Oudem. Nederl. 7942 

 Kruidk. Arch. II, ser. II, p. 301 (1900). — Mycehi hyphis re- 

 pentibus, effusis ; conidiorum catenulis erectis, cellulis inferioribus 

 cohaerentibus, superioribus facile solutis; conidiis ellipsoideis, ro- 

 tundatis, hyalinis, 23 * 12. 



Hah. in foliis Crata^gi monogynae in Hollandia, Gallia, 

 saepe cum ejus status ascophoro: Podosphcera Oxyacanthce. 



3. Oldium macrospermum P. Henn., in FI. du Bas- et Moy.-Congo, 7943 

 in Ann. Mus. du Congo vol. II, fasc. III (1908) p. 230. — Cre- 

 spitulis hypophyllis late effusis, albidis, hyphis septatis, hyalinis, 



3-7 [j.. crassis ; conidiis catenulatis oblongo-cylindraceis v. clavatis, 

 utrinque rotundatis, hyalinis, intus granulosis, 50-80 « 15-20. 



Hah. in foliis Leguminosie sp., Kisantu Congo, Africa (Van- 

 deryst). 



4. Oidium quercinum Thiimen — Syll. IV, p. 44 — var. gemmiparum 7944 

 Ferraris, Ann. Mycol. VII (1909) p. 69, cum tab. I, Oidium al- 

 phitodes Griff. et Maubl. Bull. Soc. Mycol. Fr. (1910, p. 137. — 



A typo differre videtur caBspituIis compactis et persistentibus, co- 



nidiophoris typice septatis et prsecipue hyphis sterilibus gemmu- 



las subconicas apice incrassatas 9,5-12 {x. diam. sursum gerentibus. 



Syll. fung. XXll (^1-1913) 79 



