Abstract
Roots with velamen of three orchids were examined for mycorrhizal infection: an epiphytic orchid Stanhopea tigrina, a lithophyte Dendrobium kingianum and a terrestrial Epidendrum radicans. Approximately 50% of all exodermal cells were passage cells that remained non-lignified. Long cells of the exodermis were lignified, but not suberized. A similar proportion of passage cells was infected in young and old root sections. Most coils were located in the three cell layers of cortex beneath the exodermis. A larger proportion of coils was collapsed in the older part of the roots of D. kingianum and E. radicans.
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