Study
Terrestrial Orchids: From Seed to Mycotrophic Plant
Rasmussen, Hanne N.
Cambridge University Press, 1995
A monograph on how terrestrial orchids get from a dust-sized seed to an established plant: seed structure, the fungal infection that supplies the germinating embryo, protocorm development, and how the relationship changes as the seedling becomes photosynthetic.
- Studied in
- Orchidaceae
- Sample size
- monographic synthesis of orchid germination and mycorrhizal biology
Orchid seeds contain an undifferentiated embryo and essentially no food reserve, and in nature germination requires infection by a compatible fungus that supplies carbon and minerals. The seedling passes through a protocorm stage sustained entirely by the fungus. Dependence after that varies: many species become largely autotrophic, some remain partially fungus-fed, and a minority never photosynthesise at all.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Orchid germination is a mycotrophic process, and the degree of continuing dependence is a species-level variable rather than a family-wide constant.
How NatureHQ reads it
The scoping in that last sentence is the part that matters and the part popular accounts drop. "Orchids need fungi" is true of germination across the family and is not true of every adult orchid. A phalaenopsis on a windowsill in bark chips is photosynthesising for a living; a ghost orchid with no chlorophyll is being fed by a fungus for its entire life. Stating the general claim without the life-stage qualifier turns a precise finding into a wrong one.
- Terrestrial orchids are better studied than epiphytes, and the monograph reflects that.
- Laboratory germination protocols differ from what happens in soil, where the fungal community is uncontrolled.
- Predates most molecular work identifying which fungi partner which orchids.
Sowing orchid seed with a fungus, and without one
Orchid seeds are dust with essentially no food reserve. What actually gets one from seed to seedling?
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Academic book publishersPublished as an academic monograph.
doi.org/10.1017/cbo9780511525452
This reference was resolved automatically against Crossref on 2026-08-11.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-10.