Contrary to popular belief, it does snow occasionally at sea level on Vancouver Island. Every year in either late November or early December we get a snow fall that generally shuts down the schools and makes driving hazardous. This year the snow came in mid-December and was thick and heavy. It didn’t last long but it did do some damage to our yard shrubs. One casualty was our old lilac – the weight of the snow was too much for the main branch of the tree.
Yesterday I finally got around to cleaning up the debris. I also took the opportunity to look a little closer at the lichens that were growing on it since they were now down at ground level. The variety of shapes, sizes and colours was fascinating.
I’ve attempted to work out the identification of these lichens and think that I’ve got them correct but without chemical testing and a microscope I’m relying on Pojar & MacKinnon’s Plants of Coastal BC and Lichens of North America by Brodo, Sharnoff and Sharnoff. If you’re looking for a great Christmas gift and have a few extra dollars to spend the latter is definitely worth giving to the lichen lover in your life.
Here are some of the lichens that I discovered:
This first image shows the diversity of lichen shapes, forms and colours growing on one small section of a branch on the tree. It really made me appreciate how observing nature more closely often reveals more and more detail.
Pin-cushion Sunburst Lichen
The image below is Pin-cushion Sunburst Lichen (Xanthoria polycarpa), a small leaf lichen that forms loose pincushions up to 2.5 cm across. The numerous orange discs are the fruiting bodies or apothecia. The branches of the tree were covered with this lichen in places. It often grows in association with bird droppings since it requires large amounts of calcium and nitrogen.
This next photograph is Waxpaper Lichen (Parmelia sulcata). It is characterized by a blue gray colour and is often brown at the edges. The lobes of this lichen are 3 – 5 mm wide and have a network of ridges with soredia (whitish powdery balls). The lower surface of this lichen is black in colour.
Waxpaper lichen contains salzinic acid and has been used to make a yellowish brown to dark brown dye. Hummingbirds often use this lichen as nest material which helps to camouflage their nests.
I think that this last lichen is Dotted Ramalina (Ramalina farinacea) which is extremely variable morphologically. The thallus colour ranges from pale to dark yellowish green and the lichen itself can be pendent (hanging) to bushy in appearance. Apothecia on this species is rare.
After spending some time appreciating the beauty of the lichen on these fallen branches I can only hope that new lichen will begin to colonize the new growth on what remains of our lilac. Right now it looks a little bare.