376 FUNGUS-FLORA. 



The species usually form more or less dry, loosely inter- 

 woven patches on rotten wood, colour various shades of 

 brown. 



Zygodesmus fuscus. Corda. 



Effused, brown, somewhat crustaceous, surface velvety ; 

 hyphae branched, septate, reddish-brown, anastomosing and 

 interwoven ; conidia globose, echinulate, yellowish brown, 

 9-11 fjL diameter, borne singly on short, slender, lateral 

 conidiophores. 



Zygodesmus fuscus^ Corda, Icon. Fung., iv. p. 26, f. 81 ; Sacc, 

 Syll., iv. n. 1370. 



On rotten wood, branches, &c. 



Saccardo ssijs that an Italian specimen, agreeing with the 

 present species in habit differs from Corda's figure in having 

 basidia with four sterigmata. 



Zygodesmus terrestris. B. & Br. (fig. 9, p. 358 ) 

 Efi"used, thin, brown, minutely velvety ; conidia somewhat 



elliptical or lemon-shaped, echinulate at maturit}-, 12 x 8-9 /x. 

 Zygodesmus terrestris, B. & Br., Ann. Nat. Hist., n. 1915; 



Sacc, Syll., iv. n. 1372. 

 On the naked ground. 



OEDEMIUM. Link. (fig. 26, p. 358.) 



Fertile hyphae rigid, opaque, simj^le or slightly branched, 

 with lateral or terminal, subglobose, rather large conidio- 

 phores that bear numerous subglobose conidia. 



Oedemium, Ling, Sp. PL Fung., i. p. 42 ; Sacc, Syll., iv. 

 p. 297. 



The structure of the fungi constituting the present genus 

 is not well understood. Berkeley considers, and perhaps 

 •correctly, the large lateral structures described above as 

 •conidiophores, to be the true conidia, and these are in most 

 species multicellular. 



Oedemium atrum. Link. (fig. 26, p. 358.) 

 Hyphae erect, simple or slightly branched septate, 

 blackish with a tinge of reddish-purple, opaque, densely 

 •crowded and forming a thickish black, effused layer ; conidio- 



