Furthermore , what constitutes one individual organism is not always apparent ; one living lichen may be several centimeters long or just a tiny fragment .
The organism in question is often small and sometimes hard to spot on the ground or in the leaf litter .
What constitutes one individual organism is not always apparent ; one living lichen may be several centimeters long or just a tiny fragment .
The organism in question is often small and sometimes hard to spot on the ground or in the leaf litter .