South African Microthyriaceae. 
239 
The distribution of the family in South Africa coincides with that of the 
Perisporiaceae, abundant material being found in all the humid, wooded 
districts ; but the collection in the National Herbarium is necessarily still 
very incomplete, and no collections at all have been made in many very 
promising localities. 
A series of permanent microscopic preparations has been made by the 
collodion method (11) of all the specimens mentioned, and is kept for 
reference in the Union Botanical Laboratory, Pretoria. For the determina- 
tion of the greater part of the host plants, particularly those collected in the 
Transvaal, I am indebted to Miss S. M. Stent, to Dr. J. W. Bews and 
Mr. T. R. Sim for the identification of a number of Natal plants, and to 
Dr. S. Schonland and Miss Gane of the Albany Museum, for naming a 
large collection of plants from the Eastern Province. I am also indebted to 
Miss A. Pegler and others for a number of very interesting specimens. 
Literature Cited in the Previous Sections. 
(1) VON HoHNEL. — Fragmente zur Mykologie," ' Sitz. Ber. k. Akad. d. 
Wiss. mathnat.-Klasse.' 
(2) Theissen. — " Die Gattung Asterina," ' Abliandl. der k. k. zool. bot. 
Gesellschaft, Wien,' Band vii, Heft 3, 1913. 
(3) " Le genre Asterinella. Broteria," ' Serie Botanica,' vol. x, 
1912, pp. 101-124. 
(4) <' 2ur Eevision der Gattung Dimerosporium," ' Beih. Bot. 
Zentralb.,' 1912, p. 45 ff. 
(5) "Fragmenta brasilica, IV, V," 'Ann. Myc.,' x, 1912. 
(6) Hemisphaeriales," 'Ann. Myc.,' xi, 19i3, pp. 468-470. 
(7) " Lembosia-studien," 'Ann. Myc.,' xi, 1913, pp. 424-467. 
(8) " tiber Membranstructuren bei deu Microthyriaceen als 
Grundlagefur den Ausbau der Hemisphaeriales," ' Myk. Centralb.,' 
iii, 6, pp. 273-286. 
(9) " Trichopeltaceae, 11. fam. Hemisphaerialium," ' Centralb. fiir 
Bakt.,' xxxix, pp. 625-640. 
(10) " Die Gattung Clypeolella v. HOhn.," ' Centralb. f. Bakt.,' 
xxxiv, pp. 229-235. 
(11) DoiDGE.— " South African Perisporiales," ' Trans, of the Eoyal Soc. 
of S. Af.,' V, pt. vi, 1917, pp. 713-750. 
Microthyriaceae. 
Mycelium persistent or evanescent, thyriothecia superficial, inverse, 
radiate, flattened-hemispherical or linear ; asci paraphysate or aparaphysate, 
•2-8-spored, elliptic or clavate to sub-spherical. Spores varying in form, 
