ME. G. BENTHAM ON OECHIDE^. 333 



3. Tubera, including Ornitharium, Gunnia, Camarotis, Micropera, 

 Stereochilus, and Chiloschista of Lindley, most of which have 

 been already reduced to Sarcochilus by Eeichenbach. Amongst 

 them Chiloschista (Sarcochilus usneoides, Eeichb. f.) is remarkable 

 for being entirely leafless, at least at the time of flowering. 

 Eeichenbach refers also Pteroceras, Hassk., to Sarcochilus teres, 

 Eeichb. f. ; but Hasskarl's detailed character scarcely agrees 

 with it, and I have not seen his specimen. I have already in 

 ' Flora Australiensis,' given my reasons for not taking up 

 Loureiro's barbarous name Thrixspermum in the place of the 

 well-known Sarcochilus. Trichoglottis, Blume, as to his T. lan- 

 ceolata and T. rigida, and a third apparently undescribed species, 

 is a fairly natural genus, closely allied to Sarcochilus, but has 

 been made to include several very different plants. T. retusa, 

 Blume, is unknown to me. T. pusilla, Eeichb. f., from Lindley's 

 sketch copied by Eeichenbach, appears to be a Saccolabium. T. 

 pollens and T. philippinensis, Lindl., should be referred to Stau- 

 ropsis ; and T. quadricornutus, Kurz, is probably a Cleisostoma. 

 Aeranthus, Lindl., was originally founded on two Mascarene 

 species, to which he unfortunately added the Angrcecum sesqui- 

 pedale, Thou., notwithstanding the very great difference in the 

 structure and form of the flowers, relying solely on some similarity 

 in the pollinarium. Thouars very well distinguished them, 

 placing the true Aeranthi with their prominent mentum and 

 spurless labellum in JDendrobium, and the long-spurred sesqui- 

 pedale in Angrcecum. Eeichenbach, by including Lindley's Mys- 

 tacidium, JEonia, and others in Aeranthus, still further invalidated 

 the genus, which I would again reduce to the two original 

 species. Aerides, Lour., of which we know about fifteen species, 

 chiefly Indo-Malayan, with one from Japan, combines the mentum 

 of the second series with a spur nearly that of the third, but 

 usually turned upwards on the back of the labellum. It is often 

 more or less confounded with Saccolabium, which has usually, 

 but not always, smaller flowers, no mentum, but a descending 

 spur or sack close to the base of the labellum, and several still 

 more different species have been added to it. Thus Aerides 

 appendiculatum, Wall., is a Cleisostoma, A. hystrix and A. diffbr- 

 mis, Lindl., form the genus Ornithochilus, A. toeniale, Lindl., is 

 a Doritis, A. Wightianum, Lindl., is Vanda parviflora, Lindl. 

 A. multiflorum, Eoxb. (A. qffine, Lindl.), has the habit of Aerides 

 and Saccolabium, with the perianth of Arachnanthe (Armodorum), 



