THE l i.i »B \ OF M i.i: \&K \. 



SYNOPSIS. 



I. Conidiophore short, simple; conidia catenulate. 



Conidia and oogones producing zoospores Ubugo 



II. Conidiophore elongated, branched; conidia acrogenous or pleurogenous, -ii 



1. Conidiophore with short, straight branches; conidia Forming zoospores, or ''mi. 



tying tin- whole plasm at once. 



Oospore with a thick, many Laj ere I epispore 



Membrane of epispore thin Plaat 



2. Conidiophore dichotomously Forked, the sterigmata hamate; conidia "-mitt in 



minating filament directly. 



Sterigmata arising from a disk-like enlargement of the end of the ulti- 

 mate 1 1 ranches; conidia germinating at the apex Hr< mia 



Sterigmata borne directly on the ultimate branches; conidia germin 

 laterally \ / . 



1. ALBUKO S. R Grai Nat. A.rr. Brit. Flowering Plants I . 540. L827. 

 Cystopus Leveille Ann. Sci. Nat. 3, VIII., 371. Is 17. 



Conidiophores short and simple, cylindrical or clavate, densely aggi 



sori first covered by the epidermis, finally breaking t brough,1 hick,effused, 

 white or yellowish; conidia catenulate, hyaline, rotund or spherical, form 

 ing zoospores; oospores spherical, verrucose, or reticulate. 

 Etymology: Latin albugo, whiteness. 



Albugo bliti (Biv.) OK. Rev. Gen. PI. I.,G58, foot note. L89L 

 Uredo bliti Bivona-Beknardi Stirp. Rar. III., 11. 1815. 

 Cystopus amaranthi (Sjhw.) Berk. Grevillea III.. ~> s . 1874. 



Sori numerous, white or yellowish; conidia of two forms, t he terminal globose, 

 thick-walled, sterile, the others rotund, truncate at base, l~> 20 ft in diam., 

 emitting zoospores; oospores spherical, 50 62 hi diam., epispore brown, 

 reticulate, the polygonal areolae 5-7 ». 

 In stems and leaves of Amaranthus n troflexus and .1. blitoidU s, Lincoln, 



Albugo Candida (Pers.) OK 1. c. 



Aecidium candidum Persoon Linn. Syst. Nat. ed. 13, t. :i part 2, HT.:. IT'.'l. 

 Cystopus candidus Lev. Ann Sc. Nat. Bot. 3, VIII . 371. L847. 



Sori white; conidia similar, globose or rotund, 14-18 in diam., membrane 

 homogeneous; oospores irregularly globose, 37 H in diam, epic 

 yellow-fuscous, with broad verrucose,or eery close often oonfl i 

 ridges. 

 In stems and leaves of Rhaphanus sativus, Lepidium incisum, 1 



Bursa bursa-pastoris, and Roripa palustris; Lincoln. Saltillo, Bellevue. 



Albugo portulacae (DC.) OK. 1. c. 



Uredo port ul acae De Can .hii.i.k. Lam and DeC. PL Franc, VI.,88 1815 

 Cystopus portulacae Lev. I. c. 



Sori large, yellowish epiphyllous; oonifia alike (the terminal one I ir 



thicker-walled incase of immature conidiophores only), granular, Irreg 

 ularly oblong-ovate or globose, L5xl8 ; oospores large, spherl 

 in diam; epispore brownish yellow, closelj and finely reticulated with 

 darker edges, the polygonal areolae 5 6 in .ham. 

 In leaves of Portulca oleraacea; Lincoln. Saltillo. PL XVI.. Fig t, a. I.. 



