Chasing Phantoms

Day 264: First, let me correct the dates I gave previously. Until recently, Cephalanthera austiniae (Phantom Orchid) had only been seen in Mount Rainier National Park on two occasions, both times as a single specimen. The first occurrence was in 1892, the second in 2005...a gap of 113 years. Last week, I found two with my botany partner Joe Dreimiller. Yesterday, I did a wider survey alone and discovered seven specimens, one of which had been cropped of all but its lowest blossom by a deer. The tallest of the plants was roughly 16", the shortest about 8". I took many photographs and GPSed the three locations in which they occurred, and further exploration up the drainage revealed what to my eyes looked like ideal habitat, but no more orchids. Still, seven individuals is not a bad score for a "rare and endangered" species.

Spotted from a distance

Like many other members of the Orchidaceae, Cephalanthera is a mycoheterotroph, i.e., it relies on the cooperation of a specific fungal component in the soil in order to grow and flower. Unlike some other orchids which are capable of photosynthesis on their own because they are possessed of some chlorophyll (partial mycoheterotrophs), the Phantom is an obligate mycoheterotroph, which is to say that it cannot exist without its mycorrhizal partner. Consequently, its survival depends on its ability to lay dormant for many years, waiting for the proper fungus to become active. That's why it is so rare.

Can you find all four?

Over the last five years or so, I have noticed a dramatic rise in the bloom rate of a number of mycoheterotrophic species in the Park. They have long been of special interest to me. I suspect this increase may have its origins in the milder, wetter winters we've experienced over the same period of time, as well as the warm springs which have followed them. Many fungi have been appearing in growing numbers as well. The wet weeks of early June and warm conditions later in the month set the stage for chasing Phantoms, and seems to be bringing out other mycoheterotrophs as well (notably Indian Pipe, which is beginning to erupt). However, the census of Corallorhiza maculata is down, although the count C. trifida was up substantially. Clearly, there is a fungal backstory here which I don't fully understand.

Joe and Sharon knew exactly what I meant when I shot a cryptic one-word post to Facebook last night: "Seven." Joe is recovering from shoulder surgery done only a few days ago and will be out of commission for the rest of the season. At least he got to see two.