Phycomycetse, Peronosporaceee, Phytophthora. 859 



Hab. in foliis Acliyranthis aspersB, Kisantu Congo, Afr. 

 trop. (Yanderyst;. — Nisi matrice vix ulla nota a typo dignoscitur. 



4. Cystopus occidentalis (Wilson) Sacc. et Irott., Alhugo occidentalis 3296 

 Wilson, Bull. Torr. Bot Club XXXIV (1907) pag. So, fig. 9. — 

 Soris hypophyllis, subrotundis v. irregularibus, rarius confluenti- 

 bus, superficialibus, prominentibus, subflavidis, 1-3 mm. cr. ; co- 

 nidiophoris cylindraceis, c. 40 =* 12; conidiis flavidis, breviter cy- 

 lindraceis, 14-20 « 8-16, membrana hyalina, ad medium anulo cin- 

 cta; oosporis in hospitis foliis, globosis, luteo-brunneis, regulariter 

 tenuiterque reticulatis, BO-60 [j.. diam., areolis pentagonis v. hexa- 

 gonis, 2 u.. c. cr. 



Hab. in foliis Bliti capitati, Box Canon Colorado etChe- 

 nopodii rubri, Montana, Amer. bor. 



5. Cystopus Froellchiae {WWs.) Sacc.etTroit., Albugo Fi^oelichiceWWs., 329G 

 Bull. Torr. Bot. Club, XXXV (1908) p. 362, Albugo Cladothricis 

 Wils., Science II, 27 (1908) p. 207. — Soris hypophyllis v. cau- 

 licolis, superficialibus prominentibusque, albis v. subflavidis, sub- 

 rotundis v. irregularibus, 1-3 mm. latis; conidiophoris subfusifor- 

 mibus, elongatis, 70-85^12-18; conidiis subflavidis, breviter elli- 

 psoideis, terminalibus minoribus, globosis, 12-20 « 10-18, membrana 

 subflavida, ad medium anulo cincta ; oosporis in foliis hospitis 

 brunneis, globosis, 45-80 ;j.. diam. ; episporio irregulariter v. re- 

 gulariter reticulato, areolis 7 [i. diam. 



Hab. in foliis Froelichia^ gracilis, Denton Texas Amer. 

 bor. (W. H. Long). 



6. Cystopus Gomphrenae Speg., An. Mus. Nac. Buenos Aires t. XL\ 32:»7 

 (1909) p. 283, Cyst. BUti Speg. olim, non Biv. — Conidiis eximie 

 cuboideis, 16-18 [j.. diam., tenuiter tunicatis, hyalinis, levibus; oospo- 



ris globosis, 75-90 [j-. diam., fusco-ferrugineis, opacis, levissimis. 



Hah. in foliis vivis Gomphrense perennis prope S. Juan 

 et Mendoza, nec non in foliis G. umbellat;c in Salta et Jujuy, 

 Amer. austr. 



PHYTOPHTHORA De Bary - Syll. VII p. 237, IX p 311, XVI 

 p. 396. 



1. Phytophthora Thalictri Wils. et Davis, Bull. Torr. BotCl. XXXIV 3298 

 (1907) p. 392. — Hypophylla; maculas foliorum in hypophyilo 

 suborbiculares v. irregulares subglaucas, in opipli\llo nigricantes 

 brunneo-marginatas generans; conidiophoris fasciculatis ex sto- 

 raatibus excuntibus, subsparsis, continuis, laxis, subflexuosis. 300- 



