MB. O. BEXTTTAM OX OBCIITDEJE. 347 



species from the In do -Malayan region ; anil Stereosandra, Bluine, 

 one Javan species. Tliey have all slender, erect, leafless, simple 

 stems arising from a tuberous or branching rhizome, and bear 

 a loose, simple spike or raceme of rather small flowers. Lecan- 

 orchis is remarkable for the appendage crowning the ovary, like 

 that of Epistephium. Apfajllorchis has been rightly shown by 

 Reichenbach to include the Ceylon plant which Tliwaites had mis- 

 taken for Apaturia montana, Lindl. Stereosandra is compared by 

 Blume witli Epipogum ; but the anther figured is very different, 

 and would bring it much nearer to Aphyllorcliis. 



The genuine Australasian genera of Diuridea;, twenty-one in 

 number, have so recently been worked up in the ' Flora Austra- 

 liensis,' and so admirably illustrated with several interesting addi- 

 tions by Fitzgerald in his ' Australian Orchids,' that I have no 

 remarks to add on the present occasion with regard to their re- 

 spective delimitation. Their rhizome is, with few exceptions, 

 more or less tuberiferous, producing simple erect stems, some- 

 times leafless, at least at the time of flowering, more frequently 

 bearing a single one or two, very rarely more leaves, the spike or 

 raceme simple and terminal. The anther is erect or leaning for- 

 wards, and frequently persistent ; the rostellum is terminal and 

 erect, but often exceedingly short, rarely as long as the anther ; 

 the pollen powdery-granular, sometimes so compact as to appear 

 solid. The twenty-one genera are all Australian ; for Adcnochilus, 

 which was supposed to be limited to New Zealand, has recently 

 had a genuine Australian species added to it by Fitzgerald. 

 Twelve of them are represented in New Zealand, three in New 

 Caledonia, and three (Thelymitra, Coryanthes, and Cryptostylis) 

 extend to the Malayan archipelago, and the last-mentioned genus 

 to East India ; but these extra-Australasian species are but very 

 few, and generally closely allied to .Australian ones, suggesting for 

 the whole group an Australian origin. 



Subtribe 5. Ahethuse;f. — Lindlcy's tribe of Arethusea*, as ori- 

 ginally laid out and since variously extended, has been made to 

 include genera very dissimilar in vegetative and even in structural 

 characters, and even limited, as we should propose, to a subtribe 

 of Neottiea-, and is not so distinctly marked out as could be wished. 

 It is chiefly characterized as distinct from Diuridea) by the more 

 or less incumbent anther and the short rostellum, sometimes quite 

 obsolete, sometimes slightly projecting horizontally above the 

 stigma, which is on the face of the column, either close under the 



