Maclean 1965 Journal throughout season), and time (in one hour intervals; BP = 8:00 P.M. - 9:00 P.M.) then: Topography - f = flat or level ground, or gentle slope. m = mounds ch = channel between mounds lp = low polygon tp = raised polygon tc = polygon trough po = pond st = stream bank d = disturbance - used as modifier. Vegetation: 0 = bare ground + = moss + lichens only 1 = cover less than 25% 2 = cover 25-50% 3 = cover 50-75% 4 = cover 75-100% Cover expressed as graminiform cover/ forb cover, as 2/2. Understory: Um = moss Uml = moss + lichens Ub = bare