Sunday 18 January 2015. At 2pm in the Education Centre in the Garden, Graham Haig will give an illustrated talk on a recent visit to the Butchart Gardens in Victoria, British Columbia. Friends free; visitors £2.
|find it among the Americas|
Note the lichens: these are composite organisms formed from algae or cyanobacteria (or both) living among filaments of a fungus in a mutually beneficial (symbiotic) relationship, They are sensitive to industrial air pollution and have long been used as a means of monitoring air quality.