10 n 
Dist., 9.11.17, Doidge [10898]; Woodville Forest, George, 11.11.17, Doidge [10929]; 
Howiesons Poort, Grahamstown, 17.11.17, Doidge [10960];. Lovedale, Alice, 18.11.17, 
Doidge [10979]; Hoggs Back, C.P., 15.1.18, J. and M. Henderson [11345]; Grahams- 
town, 1917 [11369]. | 
On Carissa grandiflora, Isipingo, Natal, 27.3.18, Bottomley [11380] ; Krantzkloof, 
Natal, 26.5.15, Doidge [8983]. 
On Carissa acuminata, Stella Bush, Durban, 7.4.18, Bottomley [11381]. 
This fungus was originally described by Winter from material collected by MacOwan. 
In his “ Lembosia-studien ` [Ann. Myc. XI (1913), p. 457], Theissen mentions this 
species, and dismisses it with a single sentence: `` Der Beschreibung Winter’s ist nur 
hinzuzufiigen, dass die an hyalinen Hyphenbiischel enstehenden Konidien sichelf6rmig 
sind, einzellig, beid endig spitz, farblos, 20 u x 24.’ However, he omits it from his 
synopsis of species, and from this one would gather that he was doubtful about its 
systematic position. 
The fungus on Carissa arduina is very common throughout the country, and with 
the abundant material at my disposal I have made a careful study of sections through 
the host, and find that it has a very abundant and well-developed hypostroma. It must 
therefore be placed in the Polystomellaceae. It differs from Hysterostomina in the presence 
of fairly well-developed superficial mycelium. I have therefore made it the type of a 
new genus MacOwaniella. 
MacOwaniella congesta occurs on the younger branches of Carissa spp., less frequently 
on the leaves. Stromata, superficial, round or elliptic or irregular in shape up to 4 mm. 
diameter ; loculi linear, straight, curved, or flexuous, closely crowded, irregularly arranged, 
500-800 » long and 180-220 » broad ; less frequently oval, attenuated towards both ends, 
280-340 vu. x 160-175; rarely almost circular, 160-190 u diam., 120-140» high, de- 
hiscing by a longitudinal slit. Hypothecium pseudo-cellular, colourless or light brown 
in centre, consisting of thin-walled plectenchyma. Covering membrane radial in structure. 
Hypostroma strongly developed, penetrating deep into the tissues, forming closely 
packed masses of interwoven hyphae in the intercellular spaces and in the cells. These 
are especially evident in the epidermal and sub-epidermal cells under the fruiting bodies, 
where at intervals the hyphal mass becomes thick walled and dark brown to black in 
colour, and is connected with the ascostroma by slender, brown to black, fungous pegs 
about 6 u thick, which pierce the cuticle. At or near the point where the cuticle is pierced 
the dark hyphae often penetrate laterally into the cuticle for a short distance. 
Asci oblong to clavate, attenuated into a short foot, eight-spored, paraphysate, 
60-70 » x 21-26. Paraphyses filiform, often forked at the apex, tips more or less 
conglutinate. Spores conglobate or sub-distichous, oblong, 1-septate, constricted, fuscous 
when mature, 17-18 uy x 7-9 u. 
Mycelium on the leaves well developed, fuscous, undulating, abundantly branched, 
and anastomosing, with a few sessile, dark brown, hemispherical hyphopodia, 6-5-8 u x 
6-5 u on the primary hyphae; mycelium on the branches not so well developed, hyphae 
straighter, more slender, 3-5-5 yu thick, branches parallel, with occasional elongated 
reticulations. 
9. Asterodothis solaris (K. and Cke.) Theiss. 
Ann. Myc. X (1912), p. 179; Ann. Myc. XIII (1915), p. 232. 
Syn. Asterina solaris K. and Cke., Grevillea IX, p. 33; Syll. Fung. 1, a 42, on 
Olea verrucosa, South Africa, Rabh. W., F. Eur. 365. 
Lembosia albersii P. Henn., Bot. Jahrb. XXVIII, p. 39; Syll. Fung. XVIL p- 
897, on Hlaeodendron sp. East Africa. 
Seyesia elegantula Syd., Engl. Bot. Jahrb., 1910, p. 463; Syll. Fung. XXII, 
p. 522, on Xymalos sp., Uganda. 
On Olea verrucosa leg. MacOwan, 3991, Rabh. F. Eur. 3651; Wellington, C.P., wf 
10.11.10, Doidge [1033]; Langholm Estates, Bathurst Dist., 14.7. 19, Doidge [12346]: 
Barberton, 30.2.15, Thorneroft [8826]. : a 
