98 



SYMBIOSIS. 



suggested that the reduced formation of hairs on their roots was 



due to the fimgus-hyphae behaving physiologically as root-hairs. 



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



phyllous Wullschlaegelia, a relative of Ncottia, shows no trace of 



Km. W.Coralliorliiza innate. Br. 

 (v. Tubeuf phot.) 



FIG. 20. Ncottia A'idus avis Rich. 

 (v. Tubeuf phot.) 



fungal hyphae about its mots, and yet derives nourishment direct 

 from humus. The same author found among roots of the />'///- 

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

 even the epidermis full of mycelium. 



(2) On chlorophyllous plants living amongst humus. 



According to the investigations of Frank, all our Ericaceae, 

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



