422 PUNGUS-PLOKA. 



Acrothecium xylogenum. Grove. 



Hyphae erect, straight or curved, equal, brown iDelow, 

 paler above, apex almost colourless, 120-160 /a high, bearing 

 a crown of 6-8 conidia at the apex ; conidia cylindrical, 

 apex rounded, base acute, 4-guttulate, at length with three 

 delicate septa, 14-17 X 3 ju-, hyaline. 



Acrothecium xylogenum, G-rove, Joum. Bot., 1886, p. 203, 

 tab. 67, fig. 2 ; Sacc, Syll., iv. n. 3635. 



On rotten wood. 



Allied to A, caulium, but known by the persistently 

 hyaline, 3-septate conidia. 



Tribe 19. Sporoschismeae. Sacc. 

 SPOEOSCHISMA. B. & Br. (fig. 6, p. 397.) 



Fertile hyphae erect, simple ; conidia cylindrical, septate, 

 coloured, produced in chains within the erect hyphae, and 

 eventually escaping through the ruptured apex. 



BporoscMsma, B. & Br., in Gard. Chron., 1847, p. 540 ; Sacc, 

 Syll. iv., p. 486. 



Distinguished at once by the conidia being produced 

 within the erect hyphae, and somewhat resembling an ascus 

 containing spores, if in reality this is not the case. 



Sporoschisma mirabile. (B. & Br.) (fig. 6, p. 397.) 

 Forming velvety, black patches, hyphae unbranched, 

 cylindrical, abruptly narrowed at the base, erect, 200-260 x 

 14-15 11. : within these hyphae the conidia are formed in a 

 chain ; conidia brown, 3-septate, cylindrical, truncate, not 

 constricted at the septa, 40-60 x 12 )«.. Along, with the 

 conidia-forming hyphae are others that are sterile, septate, 

 and frequently thickened at the tip. 



Sporoschisma mirabile, B. & Br., Gard. Chron., 1847, p. 540; 

 Sacc, Syll., iv. n. 2333. 



Forming coarsely velvety blackish patches in rotten wood, 

 and on stems of herbaceous plants. 



