5. Isochilus major Cham. & Schlecht. var. alatus 
(Schltr.) Correll comb. nov. 
Tsochilus alatus Schlechter in Fedde Repert. 10 (1912) 
360. 
Isochilus major var. alatus and I. major are similar in 
their leaf size and type of inflorescence, both of which 
are larger than those of var. Amparoanus. They differ 
somewhat in the shape of the leaves and in the leaf- 
sheaths. The leaves of var. a/atus are oblong and the 
leaf-sheaths are densely brownish verrucose, whereas the 
leaves of J. major are lanceolate and the leaf-sheaths are 
smooth. 
This variety is apparently extremely rare, since it is 
represented only by the type collection of I. alatus from 
Guatemala. 
SPECIMENS EXAMINED: 
GuaTEMALA—Alta Verapaz: Epiphyte in woods, Coban, July 1907, 
Tuerckheim II 1831 (Type of I. alatus, isotype examined). 
6. Isochilus major Cham. & Schlecht. var. Ampa- 
roanus (Sch/tr.) Correll comb. nov. 
Isochilus Amparoanus Schlechter in Fedde Repert. 
Beih. 19 (1928) 27. 
Tsochilus major var. Amparoanus has only the charac- 
teristic inflorescence of this group in common with var. 
alatus. It agrees with J. mqjor in the typically smooth 
leaf-sheaths and in the type of inflorescence. It is related 
to I. linearis var. wnilateralis in the strict linear leaves and 
in the comparatively rather large flowers of some of its 
forms. The flowers are said by collectors to be ‘‘lavan- 
der’’, ‘‘purple’’, ‘‘rose-purple’’, ‘‘pinkish purple’’, 
**phlox-purple’’, “‘rose-color’’ and ‘‘orange-red”’. 
This variety is found in Mexico and through Central 
America to Costa Rica. It occurs at from 670 to 2300 
meters altitude where it is found as a terrestrial, on rocks, 
t7t] 
