174 THE ORCHID REVIEW. [JUNE, 1922. 
and the lip narrow, recurved and yellow. It is difficult to give an exact 
position to this plant. Superficially it rather resembles a Renanthera, in 
-which genus it has been included under the names R. billinguis and R. 
labrosa. Eventually it was transferred to Arachnanthe. 
Concerning Arrynchium labrosum, Lindley remarked (Paxt. Fl. Gard. 
1. 142): ‘* The lip is a hollow curved blunt horn, rising from the base of the 
column with its convexity upwards; on the convexity lies a flat yellow 
wrinkled fleshy tongue, which seems as if it consisted of two layers; at the 
base the lip is concave, and has on either side a short truncate ear, with 
which it clips the column. The column is taper, short, straight, with a 
nearly circular slope. No known genus can receive this singular plant, 
unless it is thrown into a crowd of Saccolabes, among which however, it 
would scarcely be sought, for-its thick fleshy lip is very different from the 
thin membrane found in that genus. Moreover, it is essentially distinguished 
by its roste! not being extended into a long beak, as is the case in all the 
-genuine Saccolabes and Sarcanths. As for Sarcochilus, which it is said to 
resemble, that genus is quite different in the long, narrow foot on which the 
lip is placed, as well as in the nature of the lip itself.” 
It is at present perhaps better to retain these puzzling plants under one 
genus. Later, the hybridist may help to solve their affinity one to another, 
-for the fact that two species of two so-called different genera interbreed 
should go far to show their close relationship. The fact that the plant 
known as Vanda Sanderiana was included with Arachnanthes under 
Esmeralda, and then relegated to Vanda, can be taken as proof of a 
resemblance to both genera. Now it constitutes the type species of a new 
genus—Euanthe—as it differs from both Vanda and Arachnanthe. The 
interesting note in the Orchid Review, p. 2 of the present volume, gives it 
under its new generic name, but, as the parent with Vanda tricolor of a 
hybrid, it is evidently closely allied to Vanda. 
Whether hybrids will or will not be obtained between the different 
“Species of Arachnanthe, or between that genus and Vanda, its nearest ally, 
remains to be seen. Such hybrids do not occur in nature, as far as is 
known, for each species is not only localised, but is apparently highly 
specialised to attract and allow only certain kinds of insects to fertilise 
‘them. The labellums of A. Cathcartii and A. Clarkei, so decidedly motile, 
kacmecia give tise to conjecture. Their modest colouring may be an 
attraction against the brighter colours of the other segments; their motion, for 
crenata phone of an impinging wind, might also attract. 
aise the lis nical ery " erent to the action in Bulbophyllums, in which 
pels the visiting insect against the pollinia. But here the 
‘whole lip would be depressed by the weight of a moderate sized insect and 
-80 render access to the stigma apparently more difficult. Undoubtedly 
