338 ME. G. BENT11AM ON OKCHIUE^. 



four of the genera the pollen-masses are quite like the ordinary 

 ones of Yandex, two either entire or more or less divided into two 

 closely appressed portions ; in three genera the four pollen-masses 

 are quite distinct, and two genera, Appendicula and Thelasis, are 

 exceptional in the whole tribe as having eight distinct pollen- 

 masses. 



These nine genera are distinct enough to have been generally 

 admitted without hesitation, and require but little comment. 

 Five are from tropical America : — Cirrhcea, Lindl. (Scleropteris, 

 Scheidw.), five species ; Macradenia, Br. (Phynchadenia, A. 

 Rich.), one or two species; Nbtylia, IjindL, about fifteen species ; 

 Telipogon, H. B. & K., about three species; and Trichoceros,II. 

 B. & K., six or seven species, including Telipogon astroglossus, 

 Beichb. f., which Lindley, in his herbarium, has rightly referred 

 to Trichoceros. Four genera are Asiatic : — Acriopsis, Eeinw., 

 three or four species ; Podochilus, Blume, about ten species, 

 including Cryptoglottis, Blume {Hexameria, B. Br.), Platysma (af- 

 terwards Plocostigma), Blume, and Apista, Blume ; Appendicula, 

 Blume, about twenty species, including Metachilum, Lindl., and 

 Conchochilus, Hassk., to which must also be added the Epidendrum 

 hexandrum, Keen., well described in Ketz's ' Observationes,' but 

 neglected by subsequent orchidologists (this species, represented 

 in the Kew herbarium by an indifferent specimen from Bottler's 

 herbarium, closely connects Appendicula with Podochilus through 

 Brown's Hexameria) ; and, lastly, Thelasis, Blume (Oxyanthera, 

 Brongn., Euproboscis, Griff.), eight nearly allied species or marked 

 varieties. 



Tribe 3. JNeottie.e. 

 Under this name I have united Lindley's tribes of Arethuseas 

 and Neotteaa, the supposed distinctive characters of which have 

 proved far too uncertain to be relied upon, when each one had 

 genera more nearly allied in their vegetative characters to corre- 

 sponding ones in the other than to any of their own tribe. I 

 have therefore here collected all the genera in which the general 

 structure of the anther is that of the Epidendreae or of some 

 Vandeae, but with the pollen granular not waxy. The Neottieae 

 thus constituted are never pseudobulbous, and, with the exception 

 of the small subtribe Vanilleaa, they are all terrestrial. The 

 single anther is either incumbent and lid-like or erect behind the 

 rostellum, and is always perfectly two-celled. The pollen is either 



