ORCHIDACE.^ 



In the nearly related Erythrodes procera (Schltr.) Ames the 

 calli on the anterior wall of the sac are small, the lowermost pair 

 being very much reduced and consequently inconspicuous; in 

 E.plantaginea the calli are represented by much elongated thick- 

 enings, the inner pair extending nearly the whole length of the 

 sac and appearing rather as thickened nerves than as calli. In 

 E. vesicifera the thickenings of the sac are carinate and much 

 longer in relation to their height than the nearly quadrate, com- 

 planate calli of E. meccicana which are conspicuously protuber- 

 ant. Erythrodes Killipii from Panama is a closely related spe- 

 cies, but very easily distinguished by means of the thickened, 

 elongated carinae which extend from above the middle and 

 reach nearly to the base of the sac. 



Mexico, Chiapas, Pinabate, E. W. Nelson 3777, February 8, 1896. 

 6500-8000 feet altitude. 



Erythrodes minov{Presl)Aviescojnh.nov.^l\CYOQhi\us minor 

 Presl Rel. Haenk. 1 (1827) 94. Physurus minor Lindl. Gen. & 

 Sp. Orch. (1840) 503. 



Erythrodes mystacina {Reichb.f.) Ames comb. nov. Phy- 

 surus mystacinus Reichb.f. Xen. Orch. 2 (1874) 183. 



Erythrodes nigrescens (Schltr.) Ames comb. nov. Physurus 

 nigrescens Schltr. in Beihefte Bot. Centralbl. 36, Abt. 2 (1918) 

 380. 



In general habit not unlike E. Killipii Ames, but with a dif- 

 ferent terminal lobe on the lip. The plants when dried take on a 

 blackish color. This characteristic has not been noted in E. Kil- 

 lipii as represented by Killip's specimens and by Maxon 5570 

 from the Upper Caldera River, Panama. 



Erythrodes ovata {Lindl.) Ames comb. nov. Physurus ovatus 

 Lindl. Gen. & Sp. Orch. (1840) 502. 



[74] 



