Percentage cover of foliose and fruticulose epiphytic lichen species in 20 cm x 20 cm quadrats placed on the trunk of several trees along three transects in a pine forest in Sierra de Guadarrama (Madrid, Spain).
data("liquenes")A data frame with 608 observations on the following 33 variables.
Grupo. Transect identifier.
Arbol. Tree identifier within each transect.
DAP. DBH, i.e., diameter (cm) at breast height of the phorophyte tree.
Especie. Species of the phorophyte tree. A factor with levels P (Pinus sylvestris) and R (Quercus pyrenaica).
Distancia. Distance (m) from the tree to a road on the border of the forest.
Sitio. Location on the trunk. A factor with levels B (base of the tree) or P (at breast height).
Orientacion. Orientation of the quadrat over the tree trunk. A factor with levels N (facing North) or S (facing South).
Musgos. Percentage cover of mosses.
Crustaceos. Percentage cover of crustaceous lichens.
Agrietacion. A measure (percentage) of bark rugosity.
Cetraria.chlorophylla to Sp.1. Percentage cover of each recorded species of foliose or fruticulose lichen.
Riqueza. Richness of fruticulose and foliose lichen species per quadrat.
Data collected by students of Ecology of Rey Juan Carlos University in September 2016.