Physiology of the Genus Eidamia. 429 
There M. Arnaud suggested that both Monopodium and Langloisula 
macrospora are probably identical with Acremoniella atra , Corda ( 3 ). By 
the courtesy of the Cryptogamic Department of the British Museum 
(Natural History) the slides of Langloisida macrospora made by Smith and 
Pethybridge have been examined. They appear to be identical with 
Eidamia acremonioides when only the mycelium, pseudosympodial branches, 
and brown macrospores are present, as is the case when the fungus is grown 
on rice at 20° C., potato slab at 25 0 C., and potato mush agar at 30° C. 
Acremoniella atra , as figured by Saccardo ( 17 ), exhibits this peculiar type of 
branching and also apically borne brown spores, 25-28 /x long by 16-18 /x wide, 
resembling the macrospores of E. acremonioides . Langloisida spinosa , Ellis 
and Everhart, is regarded by von Hohnel ( 7 ) as belonging to the Corticiae, 
being only separated from Asterostromella by the colour of the spores. The 
writers have had no opportunity of examining L. spinosa , but consider that 
L. macrospora is certainly a Hyphomycete with a remarkable resemblance 
to E. acremonioides in the macrospore stage. 
It seems probable then that Langloisida macrospora , A. L. Smith, Mono¬ 
podium uredopsis , Delacroix, and Acremoniella atra , Corda, are identical 
and may ultimately prove to be synonymous with Eidamia acremonioides . 
The following revised description of the genus Eidamia is suggested :— 
Hyphae branched, septate, white ; conidiophore upright, branched or un¬ 
branched, septate, bearing a swollen cell with sterigmata, or the sterigmata 
may be borne singly or in groups on the unbranched or branched conidio¬ 
phore ; conidia in chains or groups, hyaline or coloured : branches similar 
to the conidiophore produce single-celled macrospores of round or ovoid 
form, yellow brown or colourless ; infertile perithecia (bulbils) present 
or absent. 
Eidamia, acremonioides , Harz. 
Syn. Monosporium acremonioides. Harz in Bull. Soc. Imp. Sci. Natur. 
Moscou, xliv, 1 (1871), p. 104, Tab. I, Fig. 3 ; Bot. Centralbl., 
xli (1890), p. 410 ; Sacc. Syll., iv, p. 115. 
Papulaspora aspergilliformis. Eidam in Cohn’s Beitr., iii (1883), 
p. 411, Tab. XXIII, Figs. 7 to 17 ; Sacc., Syll., ix, p. 339. 
Helicosporangium parasiticum. Eidam in Cohn’s Beitr., iii (1883). 
p. 414, Tab. XXIII. 
Mycelium spreading, pseudo-sympodial branching, septate, white; conidio- 
phores hyaline, often branched, septate, 3-4 mm. high, mostly smaller, 10 y 
broad at base by 6*5 /x at apex, often bearing swollen cell of 12-13 /x diameter; 
sterigmata flask-shaped, 6 /x long by 4 /x wide at base, borne on the swollen 
cell or singly or in groups directly on the hyphae of the conidiophore ; 
conidia in chains or groups, hyaline, circular or egg-shaped, 1*5-2 /x in 
diameter ; bulbils may occur on side branches ; macrospores formed singly 
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