Kelley 



32 — 



Mycotrophy 



the mulberries as of the elms. Several Ficus have been termed 

 mycorrhizal. 



As to the herbaceous members of the Apetalae : Asai says that 

 Boehmeria is not infected ; Peyronel states that Urtica is : we can 

 say no more for the Urticaceae. Asariim appears to be mycorrhizal 

 in Europe, America and Japan by a single report in each case ; Rumex 

 by two reports ; Polygonum by several. P. viviparum was said by 

 Stahl to have "innere Verpilzung" while Asai and Takamatsu both 

 state that certain Japanese species lack mycorrhizae. Phytolacca 

 decandra also does not have any according tO' Asai. Two species of 

 Atriplex are said to be mycorrhizal, the woody species wxre not in- 



FiG. 3. — Mycorrhizae in Sugar Maple, Acer saccharum. A race- 

 mose system of mycorrhizae which are "beaded", due to periods 

 of quiescence and renewal of growth. This mode of growth is 

 characteristic of Acer, Ilex and other genera. 



vestigated ; Beta vulgaris, the common beet, is mycorrhizal but not 

 Salsola, Amaranthus sylvestris was termed mycorrhizal by Trotter 

 and Scleranthus annuus by Schlicht and by Stahl, while Chenopo- 

 dium is mycorrhizal (Schlicht) or not mycorrhizal (Asai). 

 Portulaca is positive while of the CaryopJiyllaceae Gypsophila, 

 Arenaria, Stellaria, and Cerastium are in the plus column while 

 Dianthus, Silene and Sagina are negative. This is the record of the 

 herbaceous Apetalae. 



Amongst the numerous Apopetalae and Gamopetalae there is a 

 similar scantiness of information, the larger families showing a 

 number of genera that have been examined casually for mycor- 



