JENNINGS & Hanna—Corallorhiza innata R. Br. 3 
Frank,' who has conducted many experiments in this direction, 
also concludes, from growing spruce fir seedlings in sterilized and 
unsterilized soil that the mycorhiza is of service to the plant in 
enabling it to make use of the nitrogen compounds present in the 
humus. 
Althongh it is possible that there are advantages accruing to a 
mycorhiza from such a symbiotic union with the roots or rhizomes 
of a green flowering plant, one does not see so clearly what benefits 
Fig. 2. 
Portion of the mycelium of the mycorhiza, showing the ‘‘ clamp-connexions.”’ 
accompany the union of a fungus mycelium with similar organs 
of a plant devoid of chlorophyll. Thomas’, in his observations on 
Corallorhiza in America, is of opinion that the fungus supplies 
food to the host from the decaying vegetable matter of the 
surrounding soil. ; 
The genus Corallorhiza, containing some twelve well-defined 
species, is of wide distribution, extending throughout the northern 
hemispheres of the Old and New Worlds, and in the latter ranging 
as far south as Mexico. 
In the British Islands this genus is represented by one species, 
C. innata R. Br. . 
According to Babington and Hooker it is found only in Hast 
Scotland, from Ross to Berwick, living in boggy woods, but it is 
1 Ber. d. Deutsch. Bot. Gesell. Bd. x., p. 577. 2 Botanical Gazette, vol. xviii. 
B2 
