3i8 



ORCHIDACEM. 



[chap. 



1. Vanda Roxburghii, an epiphyte, frequent on the Mango 

 and other trees, with distichous, recurved leaves, and loose 

 axillary racemes of chequered yellowish and purple flowers. 



2. Plataiithera Siisannce^zxi erect "terrestrial" herb with 

 sheathing leaves, and a few very 

 large white irregular flowers, with 



Vj_- the lateral lobes of the spurred lip 

 ;5f^ deeply fringed. 



In each ot these Sub-types, as 

 in the Type-species, there is but 

 a single stamen adherent to the 

 stigma, or to a continuation of 

 the pistil immediately above the 

 stigma, called the column. 



The anther is sessile and two- 

 celled, each cell containing the 

 pollen-grains cohering together into 

 a waxy *' pollen-mass '* called a 

 pollinium. 



In Platanthera the two cells of 

 the anther are erect and nearly 

 parallel, diverging a little below. 

 Each cell contains a club-shaped 

 pollinium, connected below with a 

 slender stalk called the caudicle. 

 The caudicles terminate in minute 

 disks or knobs, which nestle in a 

 projection of the column immedi- 

 ately over the opening into the 

 long spur of the labellum. The pollinia of Platanthera 

 are quite separate from each other, and with their cau- 

 dicles and disks may be independently removed from the 

 anther-cells. 



Fig. 202. Platnniliera Sjisannce, 

 much reduced. 



