412 



DIVISION III. MODE OF LIFE OF THE FUNGI. 



Ephebella Hegetschweileri l in the fresh condition has quite the look of a 

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

 gelatinous sheath of the Scytonema-filaments is seen to be traversed by a compact 

 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), Spilonema, Gonionema, Nyl. and 

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



FIG. 177. Eph be p-.tbtsceiis, Fr. A 

 branched filiform thallus of Stigoncma with 

 the hyphae of the Fungus growing through 

 its gelatinous membranes. Extremity of a 

 branch of the thallus with a young lateral 

 branch a ; h hyphae, g cells of the Alga, gs 

 the apex of the thallus After Sachs. Magn. 

 500 times. 



Fie. 178. Ephtbe pubescens, Fr. A branched filiform thallus 

 of Sltg-O'itma with hyphae of the Fungus growing through its 

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

 solution of potash. *, c transverse sections through the uppermost 

 portion of a branch, d transverse section through the lower and 

 older portion of a branch. The cells of the Alga 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), Lempholemma (Physma) and some others are 



Itzigsohn in Hedwigia, I, 1 23. 



