Mycoheterotrophs: Plants without photosynthesis

Mycoheterotrophs are vascular plants (and perhaps one non-vascular plant) that lack chlorophyll and so can’t manufacture their own sugars through photosynthesis - hence ‘heterotrophs’. BC hosts many mycoheterotrophic plant species, and many others where at least one phase of their life is dependent on mycorrhizal fungal partners. Most plant guides describe mycoheterotrophs as saprobes - that is, they derive their nutrition from decaying organic matter. This simply isn’t correct - the truth is much more interesting. This presentation will explore the nature and meaning of mycoheterotrophy (and mixotrophy), and illustrate concepts with local examples.

Andy MacKinnon is a forest ecologist who lives in Metchosin British Columbia Canada. Until his retirement in 2015, he worked for the BC Forest Service for three decades, mostly on BC’s coast, where he was responsible for ecosystem classification and mapping and a program of forest ecology research focused on old growth structure and composition, effects of climate change, and BC’s native plants and fungi.

Admission is $5 at the door.

June 2025

July 2025