Today’s entry was written by Claire:
This serene photograph of an enchanted forest on the Olympic Peninsula was submitted via the BPotD Submissions Forum by ferngirl42 of Seattle, WA.
If you are familiar with Pacific coastal forests in the continental northwest US, you’ll know rainfall is one of the major factors in forest density and composition. The annual rainfall in some areas exceeds 350cm (~ 12ft.), permitting blanketing forests consisting mainly of western hemlock (Tsuga heterophylla), western red cedar (Thuja plicata) and Sitka spruce (Picea sitchensis). The vegetation cover is so dense, hardly any sunlight pierces through the canopy. Close to the shoreline, though, the forest stalls, and light penetrates to the forest floor.
Near the shoreline, the Sitka spruce are not only exposed to the light, but also to the constant salt-laced maritime breeze (and sometimes ravaging winds). The burls (or burrs) are wood deformations caused by a stress to the growing tips of the plant. Some hypothesize that the salt-laced wind is responsible for burl formation in these Sitka spruces, others suggest viral or fungal damage. In general, the largest burls are found further south on coast redwoods (Sequoia sempervirens), but the first and second largest burls known are on display in British Columbia, at Port McNeill, with the largest weighing in at 30,481kg (69,200lb).
In the thread posting, ferngirl42 also makes mention of searching in this area for Polypodium scouleri, a fern commonly known as leathery polypody. Scouler’s polypody (named for John Scouler), or leather-leaf fern, can be found across the western coast of North America. It is sometimes epiphytic, and ferngirl42 notes that she has found it growing on the burls of these huge conifers.