Michael [Benedito] asked :

"what are th[e] major differences between those two taxa?:

My response is a horticultural answer, rather than a taxonomic answer. 
Horticulturally 

Lycaste aromatica is a medium sized Lycaste, the flowers are relatively 
small, about 3 to 5 cm in natural spread (1.5 to 2.5 inches across). They 
are greenish yellow to orange in color, most often clear yellow. There may 
be a few small red spots visible on the base of the lip where it joins the 
column, but not a dominant feature. Flowers fragrant of cinnamon. L. 
armonatica will grow well under intermediate conditions, it tolerates both 
cool and to some extent, warm temperatures fairly well. It does not do 
particularly well in a climate with year round night temps above 70 F 
(above 21 C), but it will tolerate several months of these high night 
temperatures in good shape. 

Lycaste cruenta is a robust growing Lycaste. Pseudobulbs can be as large 
as a man's fist, of course plants may flower on smaller plants, but 
ultimate size under ideal conditions is quite large. The flowers are 
fairly large, 8 to 11 cm natural spread (3 to 4.5 inches across). Flowers 
are similar to aromatica in color - a clear greenish yellow to golden 
orange, often a greenish yellow background with an orange overlay on the 
sepals. At the base of the lip, where it joins the column, there is a 
large easily visible red blotch. This blotch is a dominant feature of the 
lip easily seen when the lip is pulled down. Fragrance is similar to 
aromatica - a spicy cinnamon scent. Culturally Lycaste cruenta seems to 
resent warm summer temperatures. It does best in cool or intermediate 
temperatures. 

Hope this helps you spot the difference between the two without having to 
disect and measure the flower parts. 
Leo
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