« 
246 Transactions of the Hoyal Society of South Africa. 
3. Parasterina rigida Doidge, sp. no v. 
Slide XXXYIII, 12. Plate XIII, fig. 5. 
Epipliyllous, forming black, carbonaceous spots up to 7 mm. diam., 
mostly on the primary veins. Hypliae brown, 5-6 fx thick, branches mostly 
alternate, anastomosing ; cells 16-20 jx long ; hyphopodia numerous, usually 
opposite, sessile, hemispherical to ovate, 6-8 x 6-6 /x. Thyriothecia gre- 
garious, flattened-hemi spherical, 250-400 /x diam,, formed of radiating 
hyphae about 5 fx thick, dehiscing by an irregular disruption of the central 
cells. Asci paraphysate, broadly elliptic to ovate, 60-75 X 30-40 /x, thickened 
round the apex, which is traversed by a pore ; paraphyses filiform, somewhat 
swollen at the tips and not so long as the asci. Spores conglobate, fuscous, 
2-celled, constricted, 27-33 x 13-15 /x, upper loculus larger than the lower. 
On leaves of Oncinotis inandensis, Buccleuch, Natal, 11/5/16, Doidge, 9722. 
AsTERiNA Lev. 
» 
Ann. d. Sc. natur., Ser. iii (Bot.), Bd. iii, 1845, p. 59. 
Mycelium superficial, branched, septate, with regular hyphopodia or 
node-cells. Thyriothecia flat to hemispherical, inverse, radial-prosenchy- 
matous in structure, without a regular ostiole ; spores escape through 
fissures in the thyriothecial membrane. Asci aparaphysate. Ascospores 
brown, 2-celled. Pycnidia similar to the thyriothecia, pycnoconidia brown, 
1-celled (Asterostomella) ; mycelial conidia 1 -celled or wanting. 
Key to the Sections. 
A. Thyriothecia without basal membrane . Sub-genus I — Dimerospoejum. 
B. Thyriothecia with basal membrane . Sub-genus II — Clypeolaster. 
Sub-genus L Dimerospoeium Fckl. 
1869. Sym. Myc, p. 89 ; {Myxasterina) v. Hohn. Fragm. z. Myk., no. 331 
(vii, p. 58), 1909. 
Thyriothecia without basal membrane, asci aparaphysate. 
A. Nodulosae : hyphae without true hyphopodia, but with swollen node-cells. 
a. Nodes 7-10 /x diam. S. A. gibhosa var. 
megathyria. 
B. Hyjohopodiatae : hyphae with true hyphopodia. 
a. Hyphopodia 2-celled. 
1. Spores verrucose or ciliate. 
i. Spores 15-19 /x long, thyriothecia 120- 
130 /X diam 4. ^. natalensis. 
ii. Spores 18-23 /x long, thyriothecia 140- 
180 /X diam. . . . . . h. A. Comhreti. 
iii. Spores 23-28 /x long . . . . 6. A. Peglerae. 
