240 Transactions of the Boyal Society of South Africa. 
Uncinnia necator (Schwein) Burr. 
Oidial stage only [Oidium Tuckeri) : — 
On Vitis viiiifera : 
Rondebosch, CP., 3/8/07 (273). 
Pretoria, 9/4/07 (282). 
Johannesburg, 24/4/07 (306). 
Stellenbosch, CP., May, 1913 (6608). 
Uncmulapolychaeta (B. & C) Trac. & Gall. (Plate XXXI.) 
On leaves of Trevia hractcolata. 
Madjadje's Mts., Zoutpansberg Dist., June, 1906; leg. J. 
Burtt-Davy (181). 
On leaves of Celtis rhamnifolia. 
Fountains, Pretoria Dist. ; leg. P. van der Bijl, 6/4/12 (2203) ; 
28/3/12 (2336), 28/5/12 (2361). 
Oidial stage only : — 
On Celtis rhamnifolia. 
Pretoria, 2/2/12 ; leg. P. van der Bijl (2096). 
Uncinula asjjera Doidge, n. sp. (Plate XXXIII.) 
Epiphylla ; mycelio arachnoideo, late effuso, albido, subpersistente ; 
peritheciis sparsis, atro-brunneis, globosis depressis, 90-105 /x diam., 
cellulis distinctis, ca 15 /x latis ; appendicibus 15-30, rectis v. leniter 
curvulis, simplicibus, eseptatis, tenue tunicatis, totis hyalinis, basi 5-6 fj, 
latis, asperulis, sursum incrassatis usque 9 /jl, apice uncinatis v. interdum 
helicoideis, perithecii diametrum leniter superantibus 125-165 jj. longis ; 
ascis 4-6, ovatis v. subglobosis, sessilibus, 51-57 x 45-48 4-6 sporis ; 
sporidiis 18-21 x 13-14 ^. 
Hah. in foliis Fici sp., Wonderboom, Pretoria Dist., 14/7/11; leg. 
J. Burtt-Davy (1838). 
U. salicis affinis. 
Uncinula Pterocarpi Doidge, n. sp. (Plate XXXII.) 
Amphigena ; mycelio epiphylla dense arachnoideo, latissimo per totam 
matricem effuso, cretaceo v. flavidulo, persistenti ; mycelio hypophyllo 
tenui, effuso, albido ; peritheciis numerosissimis, dense gregariis v. plus 
minusve sparsis, primo luteis, subglobosis, dein castaneis v. atro-brunneis, 
globosis depressis, 100-120 fx diam., plerumque ca. 114^, cellulis obscuris; 
appendicibus numerosis, 50-75, saepissime ca. 60, perithecii diametrum 
leniter superantibus, longitudine varia in qaoque perithecio, simplicibus,, 
eseptatis, rectis v. leniter curvulis, 3-5 jj. latis, sursum non incrassatis, 
apice uncinatis v. saepe subhelicoideis, hyalinis, basi demum crasse tuni- 
