240 Transactions of the Boyal Society of South Africa. 
hyaline or brown. Occur on living leaves and young parts of plants in 
humid situations. 
Key to the Genera. 
(After Theissen, Myk. Centralb. iii, p. 281 
A. Free mycelium wanting. 
I. Spores 1-celled. 
a. Spores hyaline ...... 
h. Spores brown ...... 
II. Spores 2 -celled. 
a. Spores hyaline ...... 
h. Spores brown. 
X. Tliyriothecium circular .... 
XX. Tliyriothecium linear. 
i. Asci paraphysate .... 
ii. Asci aparaphysate .... 
III. Spores 3-celled, brown, walls sub-polar 
IV. Spores 4-cellecl, brown ..... 
V. Spores more than 4-celled, hyaline . 
YI. Spores linear, filiform ..... 
B. Free mycelium present. 
I. Spores 1 -celled, brown ..... 
II. Spores 2-celled. 
X. Spores hyaline. 
1. Thyriothecia round. 
i. Mycelium with hyphopodia 
ii. Mycelium without hyphopodia 
2. Thyriothecia linear .... 
XX. Spores brown. 
1. Thyriothecia round. 
i. Mycelium with hyphopodia. 
0. Thyriothecial wall 1-layered, 
conidia 4-celled 
00. Thyriothecial wall with more 
than one layer of cells, conidia 
usually 1 -celled. 
/. Thyriothecial membrane 
secreting mucilage ex- 
ternally and internally, 
breaking down centri- 
fugally and becoming 
separated into single 
cells . . . . 
) 
Myocopron^ 
? Vizella. 
Microthyrium^ 
Seynesia. 
Lemhosina. 
Morenoina. 
Scutellum. 
Halbania. 
Phragmothyrium. 
? Ophiopeltis. 
Lembosiella. 
? Aster ella. 
Calothyrium. 
Lemhosiojpsis. 
Clypeolella. 
Englerulaster. 
