Day 228: Northern Coralroot (Corallorhiza trifida) is listed as rare in Mount Rainier National Park. Much smaller than its relatives Western and Spotted Coralroot (C. mertensiana and C. maculata), it can be extremely difficult to see in the deep forests it prefers. A full-grown stem will seldom exceed 8" in height. This tiny orchid is partially mycoheterotrophic by virtue of containing some chlorophyll, which is to say that it is incapable of complete photosynthesis on its own, and therefore must rely on specific mycorrhizal (fungal) components in the soil to facilitate the uptake of nutrients. All Coralroots are mycoheterotrophic, however, the different species depend on different fungi.
In years past, my botany partners and I have recorded as many as 23 stems in a single season over three known locales. So far in 2019, we have observed exactly ONE. I believe this fluctuation in the census represents the overall health of the mycorrhizal system, i.e., the presence or absence of moist, warm conditions during the period of winter dormancy. If conditions are not right for the mycorrhizae, the plants will not emerge. Ironically, we are seeing C. mertensiana and C. maculata emerging earlier than normal. It remains to be shown whether their numbers will be greater than average as the season progresses.
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