ORCHIDACE^ 



through a lens, to a ruby set in white enamel. The pollen co- 

 heres in masses as shown in the illustration (Plate 102, fig. 9), 

 and is violet or mauve, a very unusual color for this sub- 

 stance. The pollen tetrads are characterized by a reticulated or 

 pitted extine. (Cf. Plate 102, fig. 10.) I have observed germina- 

 tion of the pollen tetrads in situ. The stigma is extraordinarily 

 long. In fruit the perianth often persists and sometimes is to 

 be observed when the capsules are mature and at the point of 

 dehiscence. 



Triphora trianthophora is normally a woodland species occur- 

 ring in colonies. It exhibits extraordinary periodicity, and in a 

 given locality may be plentiful in one year and then rare or 

 absent for one or more years. Undoubtedly this peculiarity of 

 periodicity is in some way bound up with the phenomena of 

 vegetative reproduction referred to above. My supposition has 

 been that there is a maximum size for the tubers that bearflower- 

 ing stems, and that when the maximum is reached the tuber 

 dies ; or there may be a period during which stolon production 

 by immature stems overbalances flower production. From the 

 plate (Plate 103), in which the development of small tubers is 

 illustrated, it will be seen that the formation of tubers capable 

 of florification must require at least a growing season, and that 

 a condition might exist in which numerous tubers approached 

 the flowering age without any being present that were ready to 

 produce flower-bearing stems, the mature tubers of preceding 

 years having completed their period of activity. 



CANADA 



Douglas fide Lindley Genera and Species of Orchidaceous Plants p. 413. 



MAINE 



Brownfield, LeRoy Harris Harvey, 1899. 



[ 12] 



