of which there is in the Ames Herbarium a record of the 
type bearing a pen drawing of the lip, in two rather strik- 
ing particulars. On the flower of the former species, the 
upper bract is indicated as extending up to one half the 
length of the dorsal sepal and the petals are noted as 
about half as long as the sepals. In Maaillaria luteorubra, 
on the other hand, the upper bract is much shorter than 
the pedicellate ovary and the petals are not much shorter 
than the sepals. 
The disc of the lip of Isochilus grandiflorus is described 
as naked, but the fact that Reichenbach treated this con- 
cept as a synonym of Mawillaria luteorubra (which is 
clearly marked with a basal callus on the lip), shows either 
that Lindley failed to observe this feature or that the cal- 
lus had become detached as sometimes occurs in speci- 
mens of this group. 
It seems to me preferable that the concept represented 
by Isochilus grandiflorus should be treated as a variety 
of Mawillaria longibracteata, a species which it closely 
resembles, differing chiefly in having distinctly narrower 
leaves. 
Maxillaria longibracteata (Lindl.) Reichb,f. var. 
luteorubra (Lindl.) C. Schweinfurth var. nov. 
Camaridium luteo-rubrum Lindley Orch. Linden. 
(1846) 22, no. 114. 
Mazillaria cassapensis Reichenbach filius in Walpers 
Ann. 6 (1863) 589—Cogniaux in Martius FI. Bras. 8, 
pt. 6 (1904) 76. 
Mawillaria luteorubra Reichenbach filius in Walpers 
Ann. 6 (1863) 539. 
Camaridium cassapense Schlechter in Fedde Repert. 
Beih. 9 (1921) 165. 
Records of typical Camaridium luteo-rubrum in the 
Ames Herbarium show that this concept differs from 
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