AUSTRALIAN FUNGI. 
367 
7. HYP HOM YCETEiE. 
Fungi superficial or nearly so, rarely parasitic on insects. 
Hyphaj more or less developed, bearing free spores or conidia. 
Asci and perithecia wanting. 
Family 1. MUCEDINEiE. 
Fungi byssoid, pale or brightly coloured (rarely brownish). 
Hyphae lax (not coha; ring in fascicles). 
Section 1. AmerosporjE. Sacc. 
Conidia varying between spherical and shortly cylindrical, con- 
tinuous, hyaline or brightly coloured. 
Sub- Section 1. Micronemeae. 
Hyphce very short, or scarcely distinct from the conidia. 
Genus 1. OOSFORA. Wallr. 
Tufts effused or pulvinate, mould-like, lax or rather compact ; 
fertile threads short, and nearly simple, fragile. Conidia regularly 
produced in chains, globose or ovoid, hyaline or brightly coloured. 
1916. Oospora aphides. Cke. Mass. Grev. xvi., 76. 
Threads short, continuous, somewhat ceespitose, hyaline ; conidia 
in chains, lemon-shaped, apiculate at each end, at first nucleate, 
hyaline, white, 17-19 X 12 ft. 
On Aphides upon pumpkin leaves. Queensland. (Fig. 296.) 
Genus 2. OIDIUM. Link. 
Sterile threads decumbent, sporophores erect, nearly simple. 
Conidia ovoid, produced in chains, soon free, rather large, hyaline 
or pallid. 
1917. Oidium erysiphoides. Fr. Syst. Myc. III., 432. 
Sacc. Syll. 1S9. 
Broadly effused, indeterminate, white tufts conspicuous, rosy- 
white, threads rather erect, slender ; conidia ovate-oblong, 
pellucid, granulose within, rather large, 30-40 x 15-20 y. 
On living leaves. Victoria. Queensland. 
1918. Oidium leucoconium. Desm. Ann. Sci. Nat. 1829, p. 
102. Sacc. Syll. 190. 
Tufts effused, white ; threads creeping, with fertile branches 
short and erect ; conidia ovoid, 20-30 x 13-16 y. hyaline. 
On rose leaves,"etc. Victoria. Queensland. N.S. Wales. 
1919. Oidium Tuckeri. B. Moniteur Beige 1850, xx., 2383. 
Sacc. Syll. 191. 
Tufts densely gregarious, often confluent and forming an effused 
whitish stratum, more or less web-like, easily brushed off, becoming 
at length dingy. Sterile threads bearing lobed haustoria and 
putting out short sporophores above. Conidia elliptic or oblong, 
obtusely rounded at both ends, 2 or 3 in chains, 25-30 x 15-17 ft 
diam. Granulose within, hyaline. 
On vine leaves and grapes. Queensland. 
