ACEOSPEIEA ZYGODESMUS. 375 



ACROSPEIKA. B. & Br. (fig. 13, p. 358.) 



Sterile hyphae decumbent ; fertile erect, branched above, 

 septate ; tips of the branches somewhat spirally coiled, with 

 many septa ; conidia more or less globose, muriculate pro- 

 duced at the sides of certain of the joints of the spiral tips 

 of the branches. 



Acrospeira, B. & Br., Ann. Nat. Hist., n. 952; Sacc., Syll., 

 vol. iv. p. 282. 



Distinguished by the few rough spores being borne late- 

 rally on the joints of the spiral or curved tips of the 

 branches. 



Acrospeira mirabilis. B. & Br. (fig. 13, p. 358.) 



Fertile hyphae vaguely branched above, and closely 

 septate ; branches spirally coiled or curved at the tip, and 

 one or more of the cells near the apex bearing a more or less 

 globose, dark brown, minutely warted spore 15-20 //. 

 diameter. 



Acrospeira mirabilis, B. & Br., in Berk. Intr. Crypt. Bot., 

 p. 305, f. 69A ; Sacc., Syll., iv. n. 1366. 



On fruit of Castanea vesca. 



A most curious fungus, in which the dark granulated 

 spores are formed by a transformation of the second joint 

 from the top of the branchlets. All the four terminal joints 

 swell, but the second one only in general proves fertile, 

 though in a few instances the terminal joint is also trans- 

 formed. (Berk. & Broome.) 



ZYGODESMUS. Corda. (fig. 9, p. 358.) 



Hyphae creeping, irregularly branched, brown or pale 

 with numerous lateral swellings, the transverse septa appear- 

 ing as if they did not extend across the hypha ; conidia 

 globose or elliptical, coloured, epispore usually ornamented, 

 rarely smooth, springing from minute tooth-like prickles, or 

 from short, lateral branchlets, or sometimes from basidium- 

 like bodies bearing sterigmata. 



Zygodesmus, Corda, Icon. Fung., i. p. 11; Sacc., Syll., iv. 

 p. 283. 



