ORCHIDACE^ 



erect on the middle nerves. The upper half of the middle lobe is 

 free from calli. The most apparent difference between /. qffinis 

 and /. verticillata is found in the sepals. These are not elongated 

 and resemble very closely the sepals of Pogonia ophioglossoides. 



The plate of Isotria qffinis (Plate 107) shows two specimens 

 the roots of which deserve close attention. One of the plants is 

 apparently seven years old, with a root system that exhibits very 

 little similarity to that of /. verticillata. The other specimen is 

 a younger plant and appears to be blooming for the second time. 

 The roots of this specimen were intact, each one being provided 

 with a growing tip. Although in such limited material it would 

 be indiscreet to attempt definitive characterizations, it is well 

 worth while to suggest that the development of root-shoots is 

 either rare or wanting in Isotria qffinis. Prof. Grimes's account 

 of the distribution of the plants he observed would lead one to 

 believe that this species does not exhibit vegetative peculiarities 

 that are comparable to those that characterize /. verticillata. An 

 examination of the roots revealed the presence of mycorrhizal 

 fungi in the cortical cells. 



It is noteworthy that Isotria qffinis frequently bears two 

 flowers. It is not at all rare to find two capsules terminating the 

 stems from the base of which a single flowered growth has sprung. 



VERMONT 



Burlington, Mrs. Henry Holt, June 1901. 



MASSACHUSEITS 



Mount Holyoke Range, East Hadley, H. L. Clark, May 31, 1899. 



CONNECTICUT 



New Haven, Edzo. Duna. Ledyard, B. J. Avery, Jr., June 3, 1909. Rather 

 heavy, moist soil in woods. Stratford, C. K. Averill, October 6, 1891 (in 

 fruit). In cool moist woods under beeches; E. H. Eames <§• C. K. Averill, 

 June 3, 1892. In cool moist woods under beeches, all aerial parts glaucojus 



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