12 
10. Polyrhizon bewsii n. sp. 
On living leaves of Elaeodendron aethiopicum, Bisley, near Maritzburg, Natal, 11.4.17, 
Bews [10087]; 20.7.18, Doidge [11592]. 
Stromata amphigenous, scattered, raised, round to irregular, about 1 mm. diam., 
simple or compound, in the latter case 2-3 or more stromata arising close together become 
confluent. There is no discoloration of the leaf tissues in the neighbourhood of the 
stroma. 
Intramatrical mycelium copious, consisting of colourless hyphae 3-5-4 u thick, filling 
the intercellular spaces and penetrating right through the leaf so that stromata are usually 
formed at corresponding points on the upper and lower surface, one being older than the 
other. Each stroma is attached to the leaf by a central foot, which is a continuation of 
the brown compact hypostroma formed in the epidermal and sub-epidermal cells. This 
foot is 80-160 vy. thick, and is continued into the stroma, forming a dark, cellular hypo- 
thecium, around which the loculi are arranged. Apart from the central foot the stromata 
are unattached, lying free on the leaf surface. In old stromata the asci above the foot 
break away, leaving a cavity, so that the loculi have the appearance of being arranged 
in a circle around a sterile centre. 
Covering membrane black, carbonaceous, radiating in structure at margin, rugose. 
Diameter of a single stroma is 700-1000 1; height, excluding foot, 200-270 u. 
Asci paraphysate, briefly pedicellate, eight-spored, 70-100 u x 30-45 p, ovate, thick- 
walled round apex, with conglobate spores when immature ; later becoming more elongated, 
clavate, with distichous spores. Paraphyses linear, about 3-5 5u thick. Spores two-celled, 
almost black, opaque, slightly constricted, ellipsoid, upper loculus slightly larger, 30-33 p x 
13 -5-15 u. 
Polyrhizon bewsi Doidge, nov. sp. 
Stromata amphigena, orbicularia, atra, carbonacea, circ. 1 mm. diam., centro affixa, 
e 1-pluribus ascomatibus circinantibus concreta. Ascomata partialia, pede centrali 
80-160 vu. er., epidermide innata, versus marginum radiato-contexta, 700-1000 yu diam., 
200-270 » alto, loculis rotundatis, immersis. Asci paraphysati, clavati, breviter pedi- 
cellati, octospori, 70-100 ». x 30-45 p, paraphysibus linearibus, 3 5 y.cr. Sporae didumae, 
brunneae, opacae, leniter constrictae, elongatae, loculo supero paullo majore, 30-33 p x 
13 -5—15 u. 
Hab. in foliis Flaeodendri aethiopici, Natal, 1.9.17, leg. Bews et Doidge [10087] et 
[11592]. 
11. Placoasterella rehmii (P. Henn.) Theiss. et Syd. 
Ann. Myc. XIII (1915), p. 237 
Syn. Asterella rehmii P. Henn, Hg Bot. Jahrb. XVII, p. 114; Sacc. Syll. Fung. 
Al, p. 257. 
On Aloe arborescens, Ripplemead, Dohne, Stutterheim Dist., 25.2.15, Bell Edmonds 
[8899]. 
On Aloe matriformis, Montague Baths, December, 1915, Pole Evans [9417]. 
On Aloe natalensis, Botanic Gardens, Maritzburg, 8.4.11, Pole Evans [1440]. 
On Aloe sp., New Hanover, Natal, 9.9.13, V. d. Bijl [8892]. 
This fungus was originally described as occurring in Abyssinia on Aloe ES and 
Aloe maculata. 
Aerial mycelium not very copious, consisting of brown hyphae, 3-5-5 u thick, very 
tortuous, branched, and anastomosing. Stromata scattered or confluent in small groups, 
either round, 150-200 u diam., or more frequently elliptic, 200-280. x 120-150u; in 
the latter case straight or curved : when two or three are confluent the stroma often 
appears to be forked ; dehiscing by an irregular, round, or elongated fissure. 
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