Združba bele jelke in trokrpega mahu uspeva na hladnih in vlažnih rastiščih z močno zakisanim talnim profilom na nadmorskih višinah med 380 in 1200 m. Letna količina padavin je med 1300 in 1700 mm. Tla so srednje globoka do globoka, peščeno glinasta ilovica, precej zgoščena in slabo prepustna, delno izprana in zakisana, nezadostno prezračena ter biološko manj aktivna.

Diagnostična kombinacija rastlinskih vrst
Drevesna plast: bela jelka (Abies alba), navadna smreka (Picea abies), bukev (Fagus sylvatica).
Grmovna plast: Abies alba, Fagus sylvatica, Picea abies, Rubus hirtus, Sorbus aucuparia.
Zeliščna plast: Abies alba, Athyrium filix-femina, Avenella flexuosa, Blechnum spicant, Dryopteris dilatata, D. filix-mas, Gentiana asclepiadea, Hieracium sylvaticum, Luzula pilosa, Maianthemum bifolium, Oxalis acetosella, Picea abies, Pteridium aquilinum, Vaccinium myrtillus.
Mahovna plast: Bazzania trilobata, Hylocomium splendens, Hypnum cupressiforme, Plagiochila asplenioides, Pleurozium schreberi, Polytrichum formosum, Rhytidiadelphus triquetrus, Thuidium tamariscinum.

V drevesni plasti prevladuje bela jelka, ki dosega višine med 25 in 35 m; primešana ji je predvsem smreka, ki zaradi načina gospodarjenja ponekod prevladuje. Listavci gradijo predvsem podstojno drevesno plast, ki je slabo razvita. Grmovni in zeliščni sloj sta dobro razvita, medtem ko je posebej bujna mahovna plast.

Združba ima kljub dobremu biološkemu stanju do neke mere varovalni značaj. Nasilno gospodarsko poseganje v te sestoje, ki bi bistveno spremenilo njihovo strukturo in naravno okolje ter uničilo mikroklimo ali močnejše degradiralo tla, bi lahko ogrozilo in celo uničilo svojevrstno jelovo združbo.

Združbo bele jelke in trokrpega mahu uvrščamo v zvezo Vaccinio-Piceion.

The Bazzanio–Abietetum thrives in cool and moist sites with very acid soils at altitudes from 380 to 1,200 meters. Annual precipitation ranges from 1,300 to 1,700 mm. The soil is medium deep to deep, sandy clay loam, relatively dense, and less permeable. It is partially leached and acidified, insufficiently aerated, and biologically less active.

Diagnostic combination of plant species
Tree layer: Abies alba, Picea abies, Fagus sylvatica.
Shrub layer: Abies alba, Fagus sylvatica, Picea abies, Rubus hirtus, Sorbus aucuparia.
Herb layer: Abies alba, Athyrium filix-femina, Avenella flexuosa, Blechnum spicant,Dryopteris dilatata, D. filix-mas, Gentiana asclepiadea, Hieracium sylvaticum, Luzula pilosa, Maianthemum bifolium, Oxalis acetosella, Picea abies, Pteridium aquilinum, Vaccinium myrtillus.
Moss layer: Bazzania trilobata, Hylocomium splendens, Hypnum cupressiforme, Plagiochila asplenioides, Pleurozium schreberi, Polytrichum formosum, Rhytidiadelphus triquetrus, Thuidium tamariscinum.

European silver fir (Abies alba) dominates in the tree layer and achieves heights of 25 to 35 meters. Sometimes it is mixed with Norway spruce (Picea abies) that locally dominates under the influence of forest management. Deciduous trees can only be found in the lower tree layer, which is often poorly developed. The shrub and herb layers are well developed, and the moss layer is especially lush.

In addition to a good biological state, this forest community also has a protective role. Major economic encroachments in these stands that would substantially change their structure and the natural environment by destroying the microclimate or through serious soil degradation could threaten or even destroy this European silver fir community.

The Bazzanio trilobatae–Abietetum albae is classified in the alliance Vaccinio–Piceion.

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Wraber M. 1958: Predalpski jelov gozd v Sloveniji (Bazzanieto-Abietetum Wraber 1953 praealpinum subass. nova). Biološki vestnik 6: 36–45.