terised by the striking rostellum structure. This organ 
projects downwards almost parallel with, or slightly di- 
verging from, the front of the column and is then folded 
on itself to form an upwardly directed portion of some- 
times equal length ending in an acute apex. On removal 
of the long and narrow viscidium, which is also folded in 
a similar manner, the two lateral lobes may be easily 
separated and then appear as shown in Finet’s illustra- 
tions. Owing to the incomplete description of Angrae- 
cum clandestinum by both Lindley and Rolfe, Finet failed 
to realise that it also fell into his new genus, nor does he 
refer to any of the other species with similar rostellum 
included in the Flora of ‘Tropical Africa. 
It was Schlechter, in his account of the Angraecoid 
orchids in 1918, who first brought together all the spe- 
cies with the above rostellum. He divided them into two 
genera, Ancistrorhynchus Finet with a distinctly trilobed 
lip and a single pollinarium stipes entire or divided only 
at the apex, and secondly a new genus Cephalangraecum, 
characterised by an entire lip and the presence of two 
separate stipites to the pollinia. Incidentally in his com- 
ments on the latter genus he states that the stipe may 
sometimes be common (gemeinsam) but I cannot find 
on what authority this statement rests. It is certainly 
not true of any of the species included by him. 
When I dealt with the two genera in the Flora of 
West Tropical Africa I separated them on account of the 
difference in the stipes and also the very different appear- 
ance of the leaves. In Cephalangraecum the leaves are 
only slightly unequally bilobed at the apex with more 
or less rounded lobes whereas in the species of A ncistro- 
rhynchus which I had seen the leaves are much more 
unequally bilobed with acute lobes. The inflorescences 
also are distinctly less dense in Ancistrorhynchus than in 
the other genus. 
[ 202 ]} 
