Table 1. Wood-decaying fungal species in fragments of old growth boreal forest. Study site characteristics. Tree volume data are from 1997, whereas time-since-isolation and mean tree age represent the situation in 2017.
Site Coordinates
(N, E) a 		Area
(ha) 		 Time since isolation (yrs) All trees Spruce
Living
(m3 ha–1) 		Dead
(m3 ha–1) 		Living
(m3 ha–1) 		Dead
(m3 ha–1) 		Coarse b logs
(m3 ha–1) 		Mean age (yrs)
Puntari 70904:36165 5.9 22 216 43 152 26 11.1 178
Lauvuskylä 70891:36265 5.5 22 234 53 195 27 7.1 168
Jonkeri 70929:36364 8.4 22 197 50 134 34 14.6 193
Vepsä c 70917:36154 7.7 22 231 24 118 7 2 133
Kujanki 70869:36179 4.9 32 253 42 162 26 9.5 181
Näveri 71042:35997 4.1 35 343 59 177 14 4.4 144
Luhtavaara 71525:36104 13.8 32 245 29 161 10 3.9 164
Pitkävaara 71622:36171 9.6 32 259 40 126 13 4.6 159
Ypykkävaara 71584:36228 9.2 22 217 25 151 9 4.2 168
Iso-Matojärvi 70867:35907 4.3 35 260 64 162 35 18.3 178
Luvesuo 71640:36213 7.5 35 220 47 125 13 4.2 164
Pellinkangas 71354:35946 3.3 35 126 27 70 16 8.2 107
Kuivikkovaara 71256:36541 3.6 32 145 50 82 13 7.3 224
Elimyssalo d 71293:36674 6.4 >100 205 46 61 5 1.4 144
Juortanansalo d 71678:36359 6.2 >100 198 14 128 5 1.3 155
Tuli-Varpusuo d 71646:36167 10.8 >100 145 37 109 19 9.8 167
a Based on Finnish YKJ coordinate system; b Diameter at breast height ≥ 20 cm; c One third of this area was clearcut between 1997 and 2017; d Natural forest fragments surrounded by open peatlands.
Table 2. Studied wood-decaying fungal species and their abundance (number of logs occupied) in fragments of old growth boreal forest in 2017.
Study species IUCN-status 2001/2019 a Ecology b Mean ± SD Min/Max Total
Amylocystis lapponica (Romell) Singer VU/NT Annual, brown rot 7.7 ± 8.3 0/27 123
Fomitopsis rosea (Alb. and Schwein.: Fr.) P. Karst. NT/NT Perennial, brown rot 7.8 ± 9.0 0/32 124
Phellinus ferrugineofuscus (P. Karst.) Bourdot NT/LC Perennial, white rot 16.3 ± 16.7 0/53 260
Phellinus viticola (Schwein.: Fr.) Donk LC/LC Perennial, white rot 49.5 ± 35.2 7/113 792
Leptoporus mollis (Pers.: Fr.) Quél. LC/LC Annual, brown rot 0.8 ± 1.0 0/4 13
Phlebia centrifuga P. Karst. VU/LC Annual, white rot 1.6 ± 3.3 0/12 25
Phellinus nigrolimitatus (Romell) Bourdot and Galzin LC/LC Perennial, white rot 1.9 ± 3.0 0/12 31
Fomitopsis pinicola (Sw.: Fr.) P. Karst. LC/LC Perennial, brown rot 48.6 ± 39.0 3/131 777
a Rassi et al. (2001) and Hyvärinen et al. (2019); VU = vulnerable, NT = near-threatened, LC = least concern; b Niemelä (2016)
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Fig. 1. Occurrence of wood-decaying fungi in fragments (n = 16) of old growth boreal forest. Changes in the number of occupied fragments between 1997 and 2017. Full author references of fungal taxa are shown in Table 2.

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Fig. 2. Abundance of wood-decaying fungi in fragments of old growth boreal forest. Changes in species abundance (number of logs occupied) between 1997 and 2017. Full author references of fungal taxa are shown in Table 2.