South African Microthyriaceae. 
243 
1. Englerulaster Gymnosporiae (P. Henn.), Th. 
Slide I, 16. 
Beih. Bot. Centralb. 1912, pp. 51-54 ; Myk. Centralb. iii, p. 277. 
Dimerium Gymnosporise (P. Henn.), Svd. Ann. Myc. vii (1909), 
p. 546 ; Trans. Eoy. Soc. of S. Af . v, Part vi, p. 719, PI. Iviii, f . 7. 
Dimerosporium Gymnosporiae P. Henn. Syll. Fung, xvi, p. 408. 
Epiphyllous or amphigenous, sub-crustaceous ; mycelium pale fuscous, 
radiating, effuse, hyphae 7-11 thick, sinuous, septate, with, a few small 
hypliopodia ; hypliopodia sessile, 1-celled, hemispherical. Thyriothecia 
gregarious, hemispherical, black, opaque, 90-110 /x diam. Asci ovoid, 
rounded at the apex, sub-tunicated, attenuated at the base, sometimes very 
briefly pedicellate, 35-50 x 30-45 ^, 8-spored, paraphysate. Spores con- 
globate, ovoid, 1-septate, constricted, fuscous, 18-24 x 10-13 /x. 
On leaves of Gymnosporia sp., Umbelusi, Portuguese East Africa, 
Howard, 523 ; Empangeni, Natal, 11/7/17, v. d. Bijl, 11367. 
On Putterliclda, sp. Isipingo, Natal, 21/5/15, Doidge, 10154. 
2. Englerulaster Popowiae Doidge, sp. nov. 
Plate XIII, fig. 1. Slide XLY, 6. 
Epiphyllous, forming thin black spots up to 5 mm. diam. ; mycelium 
brown, radiating ; hyphae 5-6 fx thick, frequently septate ; branching oppo- 
site or irregular ; hypliopodia sessile, alternate or unilateral, occasionally 
opposite, capitate to ellipsoid, some at right angles to the hyphae, others 
bent or curved inwards, broadening at the base, 10-13*5 x 6-8 ft, sometimes 
up to 16 /X in length. Thyriothecia dark brown but seldom quite opaque, 
160-190 [x diam., radiating hyphae 5-6 /x thick, margin coarsely fimbriate, 
dehiscence by an irregular central fissure which extends outwards to the 
margin and leaves the ripening asci exposed. Asci spherical to ovate, 
8-spored, apedicellate, not tunicated, often slightly angular by compression, 
40-47 x 30-40 /x, aparaphysate. Spores brown, 2 -celled, constricted, cells 
equal or upper loculus slightly larger, each loculus almost spherical, 
minutely scabrous when mature, 21-27 x 10-13-5 /x. 
On leaves of Popowia caffra, Buccleuch, Natal, 24/3/16, Doidge, 9714; 
East London, 24/11/17, Doidge, 10917. 
3. Englerulaster orbicularis (B. & C.) v. Hohn. 
Fragmente z. Myk. 520, Sitz. Ber. k. Akad. d. Wiss. math.-nat. Klasse. 
Asterina orbicularis B. & C, G revillea, iv, p. 8 ; Syll. Fung, i, p. 46 ; on 
living leaves of Ilex coriacea, Florida, Eabh.-Wint. Fung. Eur. 3439. 
Dimerosporium orhiculare Mart., Journ. of Myc. i, p. 146 ; Ell. <fc Ev. 
North American Pyrenomycetes, p. 32. 
Plate XIII, fig. 2. Slides XVI. 1, 2 ; XXIII, 13-16; XXIV, 1, 10; 
XLII, 11-13. 
