CHARACTERISTICS OF THE TRUE FUNGI 



47 



Fig. 15. — Details of the mycelium of Armillaria niellea. I, Piece of mycelium 

 on slide; II, piece of old mycelium {Rhizomorpha sublerranea); III, rhizomorph pro- 

 ducing fruit bodies; IV, apex of rhizomorph capable of growth; (a) peripheral hyphs; 

 {b) pseudo-epidermis; (c) growing point; {d, e, h) pith; (/?) hollow center. (7 and 

 IV after Brefeld; III, after Hartig in Zopf, Die Pilse, 1890, p. 25.) 



