South African Microihyriaceae. 
241 
//. Thyriothecial membrane 
not secreting mucilage 
externally, at the utmost 
breaking down only in 
the centre. 
a. Asci paraphysate . Parasterina. 
h. Asci aparaphysate . Asterina. 
ii. Mycelium without hyphopodia . Asterinella. 
2. Thyriothecia linear. 
i. Asci paraphysate. 
a. Mycelium hyphopodiate . . Lemhosia. 
h. Mycelium non-hyphopodiate . Echidnodes. 
ii. Asci aparaphysate. 
a. Mycelium hyphopodiate . . Morenoella. 
b. Mycelium non-hyphopodiate . Echidnodella. 
III. Spores 5-celled, brown ..... Amazonia. 
MiCROTHYRIUM DeSUl. 
Ann. Sc. nat. xv, p. 137 (1841) ; Syll. Fung, ii, p. 662. 
Thyriothecia superficial, dimidiate, flattened-hemispherical, formed of 
radiating hyphse. Asci aparaphysate. Spores hyaline, 2 -celled. Free 
mycelium absent. 
Microthyrium maculicolum Doidge, sp. nov. 
Plate XYIII, fig. 40. Slide XL VI, 18. 
Epiphyllous, forming raised, blister-like, light-brown areas up to 1 cm. 
diam. on the upper side of the leaf, on which the thyriothecia are visible 
as minute black points. Mycelium pale, effuse, evanescent. Thyriothecia 
dark brown, numerous, scattered or sub-gregarious, flattened hemi- 
spherical, sometimes more or less angular by contact, 150-190 diam. ; 
composed of radiating hyphse 3-4 jx thick, cells 3-10 /x long, central cells 
almost cubical, the more elongated ones near the circumference, margin 
entire. Asci 8-spored, not numerous, usually 3-7 in each thyriothecium^ 
aparaphysate, elliptical with broadly-rounded apex, 70 X 27 /x, or obovate, 
50-67 X 30-43 /x, apedicellate, uniformly thinly tunicated, wall barely 1 /x 
thick. Spores conglobate or sub-parallel, hyaline, 1-septate, upper loculus 
decidedly broader, 21-23-5 x 6*5-10 jU. 
On leaves of Capparis ? sp., Durban, 11/4/18, Bottomley, 11668. 
Seynesia Sacc. 
Syll. Fung, ii, p. 668. 
Similar to Microthyrium, but spores brown. 
