Rhaphidorrhynchus cornutus Finet in Mém. Soc. Bot. 
France 9 (1907) 34, t. VI, figs. 88-42. 
Gussonea cyclochila Schlechter in Beih. Bot. Centralbl. 
33, Abt. 2 (1915) 425, et lc. 36, Abt. 2 (1918) 92, et 
in Fedde Repert. Spec. Nov. Beih. 33 (1925) 374, et 
l.c. Beih. 68 (1982) t. 96, no. 383. 
Comoro IsLtanps: Grand Comoro, Combani Forest, Sept. 1884, Hum- 
blot 238 (Tyrr). 
Mapagascar: Rigny Bay, Boivin 2278; Sainte-Marie, Boivin 2349; 
Moratenobe, Decary 2346; Namoroka, Ambongo, Dec. 1926, Perrier 
17829; Marofondalia, near Morondava, Nov., Perrier 1841; near An- 
tananarivo, Bang (all not seen). 
There seems little doubt that Perrier de la Bathie is 
correct in considering Gussonea cornuta Ridl. and An- 
graecum cylochilum Schltr. to be conspecific. iS. cornuta 
differs from S. aphylla (Thouars) Summerh. in the fewer- 
flowered inflorescences, the more or less orbicular lip 
lamina retuse at the apex, the spur tapering towards the 
apex, the more acute rostellum lobes and the longer stipes 
to the pollinia. In general features it conforms well with 
the genus So/enangis except that the lip lamina is better 
developed. The tour species S. elavata (Rolfe) Schitr., 
S. scandens (Schitr.) Schltr., SS. aphylla (Thouars) Sum- 
merh. and iS. cornuta (Ridl.) Summerh. form a series in 
which the lip lamina is progressively well developed in 
comparison with the uniformly large spur. 
Encheiridion Summerhayes gen. nov. 
Epiphytica, aphylla. Caulis brevissimus, radices nu- 
merosas simplices flexuosas emittens, apice cataphyllis 
imbricantibus subcartilagineis obtectus. L2florescentiae ex 
axillis cataphyllorum ortae, simpliciter racemosae, mul- 
tiflorae; pedunculus brevis; bracteae brevissimae, vagi- 
nantes. #Vores alternati, parvuli, breviter pedicellati. 
Sepala et petala vix patentia, lateralia obliqua, petalis 
quam sepalis paulo latioribus. Labellim trilobatum ; lobi 
