412 



DIVISION III. — MODE OF LIFE OF THE FUNGI. 



Ephebella Hegetschwoilori ' in the fresh condition lias quite the look of a 

 Scytonema (Fig 167, B, g) ; but if the plant is heated in solution of potash the 

 gelatinous sheath of the Scytoncma-filaments is seen to be traversed by a compacl 

 weft of very delicate hyphae running chiefly in a longitudinal direction, out of which 

 apothecia are sometimes, but rarely, developed. 



The thallus of Ephebe (Fig. 177, 178), Spilonoma, Gonionema, Nyl. and 

 Lichonosphacria, Bornet has the structure and the branched shrubby form of 



1 !■ . !-;, Epk be pubescens, Fr. A 

 i filiform thallus otStigonema with 

 the hyphae of the Fungus growing through 

 its gelatinous meml i ni I Ktremity of a 



branch of the thallus with a young lateral 

 branch a ; h hyphae, g cells of the A 

 the apex of the thallus After Sachs. Magn. 

 500 times. 



1 ■■.. 1;-. Ephebt pubescens, 1 r, A branched filiform ihallu* 

 ff Sttgonema with hyphae of the Fungus growing through its 

 gelatinous membranes, a tip of the thallus after being boiled in 

 solution of potash. f>, ftransversesectionsthroughthe uppermost 

 portion ofa branch, (/transverse section through the lower and 

 older portion ofa branch. The cells of the AJga are indicated by 

 the dotted shading. Magn. 390 times. 



Stigonema, Ag. (Sirosiphon, Kg.) with the addition of the hyphae which pass in the 

 longitudinal direction through the outer wall of the Stigonema-filament and grow in 

 length behind its advancing apex; but their branches are seen in older transverse 

 sections of the Alga to intrude in numbers between its cells. Single branches of the 

 Alga which is attacked by the Fungus may continue quite free from it. 



The genus Collema and its nearest allies Synechoblastus, Leptogium, Mallotium, 

 Obryzum, Plectopsora (Arnoldia), Lcmpholemma (Physma) and some others are 



1 Itzigsohn in Hcdwigia, I. 123. 



