LOPHODEEMIUM. 



239 



Lophodermium nervisequium (D. C.)^ (U.S. America). This 

 very common fungus attacks both old and young silver firs. 

 The needles die after becoming brown, and remain for a long 



1/ 



Fia. 124. — lophodermium nervisequium 

 on Abies pectinata (Silver Fir). 1, Under 

 surface of needle with apothecia. 2, 

 Upper surface with pycnidia. 



Fig. 125. — Lophodermium nervisequium. Section 

 of a needle of Silver Fir. b, Pycnidium on 

 upper surface shedding conidia. a, Apothe- 

 cium on the lower surface. (After R. Hartig.) 



Fig. 126. — lophoderviium nervisequium on Silver Fir. Portion of a ripe apothe- 

 cium. a a, Filamentous paraphyses; rod-like cells (conidia?), k, abjointed from 

 the apex of the paraphyses ; the asci contain eight spores about half as long as 

 the ascus iiself , four occupying the upper half, four the lower ; c, a rudimentary 

 ascus; some mature spores possess a gelatinous coat, others do not; spores 

 escape by an apical opening, e, or by rupture of the ascus,/; two germinating 

 spores are also shown, one with a gelatinous coat, the other without. (After 

 R. Hartig.) 



time hanging on the twigs. The disease varies in its develop- 

 ment on the mountains and lowlands, according to climatic 

 conditions. 



^R. Hartig, WicMige Krankheiten^ 1874, 



