76 



and a^ show as a rule only one cavity with two pollinia, the 

 other half of the anther being petaloid or foliaceous. 



One of the above flowers lacks the labellum *). 



Dendrohium tetraedi^e Lndl. 



Habitat Java. 



Coll. 1900. 



A regular peloria (Fig. 29, 30). 



Dendrobium tetrodoii Rchb. f. 



Habitat Java. 



Coll. October 1895. 



This flower is perhaps only known as a regular form, accor- 

 ding to Mr. Smith corresponding to D. tetrodon Reichb. fil. 

 Miquel in his „Flora van Nederlandsch Indie" 2) suggests the 

 question whether it is a peloria of Dendrobium macrostachyum. 

 The remarkable thing of our specimen consists in the three 

 antisepalous stamens developed as such. Compare with this plant 

 D. normale Lindl. which according to Penzig has always an 

 outer whorl of three well developed stamens. 



Dendrohium spec. 



Habitat Ambon. 



Synanthy. The parts of the flower are arranged in two whorls 

 round the two gynostemia which occupy the centre, just as in 

 that peculiar Digitalis-variety where the topmost flower has 

 grown together with the preceding. (Fig. 31—33). 



Dendrohium Wardianum Warner. 



Habitat India. 



Coll. September 1899. 



Many Dendrobiums belonging to the afiinity of D. nobile, 

 D. Pierardi, D. tortile etc. produce their inflorescences at the 

 nodes of the slender stalks when these have shed their leaves. 

 Later still on the same spots they produce as a rule shoots 

 with roots which behave perfectly like new plants. 



1) The occurrence of a' and a^ baa been once observed by Masters in D. haemo- 

 glossum Roxb., also the absence of the labellum in U. nobile. 



2) IV, p. 636. 



