ME. Q. BENTHAM ON OECHIDE^:. 337 



Thus Gussonia, A. Eicb., and Microcoslia, Lindl., both closely- 

 allied to if not varieties of Angrcecum aphyllum, Thou., are leaf- 

 less at the time of flowering. A. cauleseens, Thou., and five or 

 six allied species, may be sectionally distinguished in Mystacidium 

 under the name of Gomphocentrum , by the spur of the labellum 

 clavate at the end or broadly saccate, their loug leaves are rigid 

 as well as the stem, and the stipites of the pollinarium filiform 

 at the base are clavate under the masses. A. pellucidum, Lindl . 

 has a similar habit and pollinarium, but the spur is acute, 

 Another very distinct section of Mystacidium would consist of 

 A. pectinatum, Thou., and A. distichum, Lindl,, two small species 

 with numerous small distichous leaves, the lateral flowers usually 

 solitary and almost sessile, and thestipites of the pollinarium so short 

 as to make the pollen-masses appear sessile on the gland or scale, 

 but the connecting viscum readily extensible into elastic threads. 

 Eeichenbach unites the whole genus Mystacidium with Lindley's 

 Aeranthus, in which, however, I find it impossible to concur. 



There remain two American genera, Dendrophylax, Eeichb. f., 

 three West-Indian aphyllous species (two of which Eeichenbach 

 classes as " Aeranthi aphylli grandiflori"), and Todaroa, A. Eich., 

 about fifteen very small-flowered species dispersed over tropical 

 America, and united by Eeichenbach with Aeranthus. Both 

 genera, however, appear to me to be sufficiently distinguished 

 from their African allies by the form of the perianth and some 

 other minor characters. Todaroa, however, cannot retain that 

 name, as it was preoccupied in Umbellifera?. I should propose 

 to replace it by Campylocentrum. 



Subtribe 8. Notylieje. — This subtribe differs from all other 

 Vandeae in the rostellum, which is erect at the top of the column 

 or slightly inclined forward, as in many Neottieae (Spiranthese), 

 and at the same time usually grooved or concave at the back, 

 half embracing the closely appressed erect anther ; the stigma in 

 front of the rostellum, usually on a level with the base of the 

 anther, is often nearly horizontal. The habit is in most cases 

 that of the smaller Oneidieae, the short stems ending in unifoliate 

 pseudobulbs ; but in two or three genera there are no pseudobulbs, 

 but the stems are covered with short distichous leaves, as in 

 Dichcea or Lockhartia, or their allies, and in one genus the leaves 

 of the pseudobulbs are plicate. The pollinarium has one or two 

 long stipites, descending from a small gland at the end of the 

 rostellum, and usually linear or shortly dilated at the end. In 



