The primeval forest Hojná voda belongs together with Žofínský prales to the oldest protected areas in the Czech Republic. It is predominated by beech; spruce is frequently intermixed. Other trees are rarely present in small scree forest fragments. Even though it covers only a small area of 9.2 ha, the locality is an important refuge for many rare and old-growth forest lichens. A total of 156 lichens and 12 non-lichenized fungi were recorded. Most lichens (110) were recorded on trees, especially on beech (101), but epixylic lichen communities are species-rich (43) as well. Micarea parva and Pertusaria macounii were recorded at their second localities in the country. Alyxoria ochrocheila, Arthopyrenia cinereopruinosa, Biatora helvola, B. ocelliformis, Fuscidea arboricola, Gyalideopsis helvetica, Multiclavula mucida, Opegrapha trochodes, Thelopsis rubella and Verrucaria consociata are other remarkable species.
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