98 



SYMBIOSIS. 



suggested that the reduced formation of hairs on their roots was 



due to the fungus-hyphae behaving physiologically as root-hairs, 



Johow, in opposition to Frank, states that the non-ehloro- 



phyUous Wullschlaegelia, a relative of Neotiia, shows no trace of 



Fig. 19. — Coralliorhiza innata Br. 

 (v. Tubeuf phot.) 



Fig. 20.— iVeodin Sidut avis Rich, 

 (v. Tubeuf phot.) 



fungal hyphae about its roots, and yet derives nourishment direct, 

 from humus. The same author found among roots of the Bur- 

 manniaceae, some free from fungi, and some with the rind, and 

 even the epidermis full of mycelium. 



(2) On cblorophyllous plants living amongst humus. 



According to the investigations of Frank, all our Ericaceae, 

 Epacrideae, and Empetraceae, living in the humus of moor, heath. 



