Wilhelm Barthlott, Bernadette Große-Veldmann, Nadja Korotkova. Orchid seed diversity. A scanning electron microscopy survey. Berlin, Botanischer Garten und Botanisches Museum Berlin-Dahlem, 2014.

Englera is a monographic series, published at irregular intervals by the Botanic Garden and Botanical Museum Berlin-Dahlem (BGBM), Freie Universität Berlin. In scope it is an international series, publishing peer-reviewed original material from the entire fields of plant, algal and fungal taxonomy and systematics, also covering related fields such as floristics, plant geography and history of botany, provided that it is monographic in approach and of considerable volume.