314 MR. H. N. RIDLEY’S REVISION OF THE 
t shortened, and the flowers are larger and more rounded in 
outline than in the Dienias. In M. gracilis of the Dienia section 
the flowers are almost sessile, with short thick ovaries and 
pedicels. This seems almost a connecting-link with the curious 
section Pedilea, in which the flowers are almost sessile on a 
- thickened rhachis, in which are depressions to receive the very 
short pedicel. The inflorescence is thus almost truly a spike, 
very dense, the flowers almost overlapping each other. Besides 
these sections there are in South America two remarkable species 
which seem to be allied to no other known forms, M. caulescens 
and M. tipuloidea. In the Old World, starting again from the 
M. monophyllos form, we have a number of species with small 
green flowers and few leaves; M. muscifera is an example. From 
these we may derive the section Crepidium of Blume, with nume- 
rous leaves, frequently oblique, and often fewer and larger showy 
flowers on longer pedicels, of which the true M. Rheedü is a 
typical form. M. commelinifolia, unaccountably referred by Mr. 
. Bentham to Platyclinis, belongs to this section, as the form of 
its flowers shows, though its stem and leaves are quite peculiar. 
Rut more no oes cese ana ME. aeos and M. stelido- 
11 ta thala ee: aiad’ 
eens aa « Dish um mu 
MiIoRoSTYLIS, Nuttall, 
Gen. Amer. ii. p. 196; Lindl. Orch. Pl. p. 19 ; Orch. Scelet. 
no. 185; Benth. Gen. Plant. iii. p. 494. 
Pterochilus, Hook. & Arn. Bot. Beech. Voy. p. 71, t. 17. 
Dienia, Lindl. Bot. Reg. sub t. 825; Orch. Pl. p. 22. 
Pedilea, Lindl. Hook. Fl. p. 115; Orch. Scel. no. 144, p. 27. 
Crepidium, Blume, Bijdr. p. 387. 
. Achroanthes, Rafin., fide Endl. Gen. p. 189. 
Malaxis sp., auct. veter.—Ophrys sp., auct. vet. 
Monorchis, Mentzel, Pug. t. 5. l 
§ Dienie Americane.—Folium singulum. 
Flores minimi dissiti in racemo longo, pedicellis longiusculis. 
Pedicelli capillacei 4 millim. longi. 
Flores virides. 
Folium ovatum cordatum. 
Labellum lanceolatum triangulare. 2. maianthemifolia. 
Labellum subtrilobum .......... 3. cordata. 
