Systematics of Draconanthes, Lepanthes subgenus Marsipanthes and subgenus Lepanthes of Ecuador : addenda to Brachionidium, Lepanthes subgen. Brachycladium, Platystele, Pleurothallis subgen. Aenigma and subgen. Ancipitia - Luer, Carlyle August 1922-2019 (Icones Pleurothallidinarum, 1996)