SUBGENUS Pleurothallis SECTION Pleurothallis SUBSECTION Acroniae SERIES Amphygiae Luer 1998
Characterized by the caespitose habit with well developed ramicauls that are usually longer than the leaf and carrying a terminal, singel flowered [this is the basis for the 2 series], long-pedunculate inflorescence. The flowers differ in the completely connate lateral sepals form a synsepal that is similar to the dorsal sepal. The petals are prominent, membraneous and mostly broad, frequently descending and sigmoid in outline, and are often ciliate, denticulate, fringed or pubescent. The lip is [one exception P nox-media] triangular to trilobed and the apex is acute or apiculate if obtuse and the lobes are more or less incurved or erect and are not prolonged into lateral lobes. The variously developed glenion is mostly present but an intricater callus is only occasionally present on the disc. The base of the lip is variously deflexed below the laterla angles and hinged tothe thickened base of an obsolescent column foot. The semiterete, usually short column carries an apical anther and a stigma which is transverse or bilobed and the ovoid pollina have a minute, granular viscidium. This subsection and amphygiae are not distinctly separated in various borderline species and for this reason they later were separated by Luer into the genus Acronia with three sections, Acronia, Amphygia and Macrophyllae-fasciculatae.
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