Roof residents, or where green is not necessarily goodWritten January 21, 2013, published in late January, 2013, all photos by Kathleen Sayce
|Two species of moss share space on an asphalt roof with a brown-black cyanobacteria, Nostoc commune. The mosses are seen year round; this bacteria appears in late fall on suitable roofs.|
|Two mosses grow together on a roof. One is starting to produce spores (the red stalks will grow spores in a few weeks); this is a cosmopolitan moss, Ceratodon purpureum.|
|Cyanobacteria, Nostoc commune, forms thick gelatinous masses on roofs among leaf litter and moss patches.|
This healthy clump of moss had three worms living beneath it when it was turned over.