104 Mr P. Sewell on Scrophidariacece. [sess. li. 



and yet related to a normally pentamerous? There must be 

 some explanation of the transition from one form to the 

 other, and I think that this unusual ease of Fentstemon 

 instanced hj Braun himself serves reasonably to connect the 

 two conditions. 



On the Mechanism for Fertilisation in the Floivers of 

 Bolhophyllum LolUi. By Gustav Mann. (Plate III.) 



(Read 14th July 1887.) 



BolbophyUum Lohhii was discovered in Java by Mr Thomas 

 Lobb, and was named after him. This orchid is described in 

 the Botanical Magazine, No. 4532. The flowers are said to 

 be 4 inches across, yellow, shaded with cinnamon, spotted 

 with light brown, and speckled outside with brown purple; 

 but the flowers of the specimen I saw were not very conspi- 

 cuous, the diameter being between 2 to 3 inches, while the 

 colour was a dirty yellowish brown, with reddish-brown spots 

 at the back of the perianth and on the internal surface of 

 the upper part of the column, the latter being yellow near 

 the stigmatic surface, while dirty white towards the prolon- 

 gation carrying the labellum. The labellum was dirty yellow, 

 but this colour was nearly obscured by a great number of 

 small reddish-brown spots. The superior sepal had a few 

 faint guiding lines of a brownish colour, all directed towards 

 the pollinia. The guiding lines of the lateral petals were a 

 little more distinct, while the two inferior sepals were attached 

 halfway down the column, and exhibited each nine dark-bi'own 

 guiding lines, which were also directed towards the pollinia 

 and stigmatic surface. The spreading solitary flowers have 

 a pleasant though not very strong smell. 



The column (figs. 4 and 7) is prolonged downwards, form- 

 ing a hook-like structure, at the apex of which is the labellum, 

 and this column consists of the following parts : — 



(1) The anther case and pollinia. 



(2) Two lateral collar-like expansions, which surround the 

 stigmatic surface. 



(3) The stigmatic surface pro])cr. 



(4) The hook-shaped prolongation already mentioned. 

 Th(! anther case is a lid-like structure containing the two 



pollinia, which in this case have no caudicle or viscid disc, 



