Gozd smreke in navadnega tevja je aconalna mikroklimatsko pogojena gozdna združba kraških drag na nadmorskih višinah od 1050 do 1250 m. Relief je srednje razgiban, ponvasto dno drag je položno, večinoma ravno in preide v srednje strmo pobočje. Geološka podlaga so morene, ki so sestavljene iz večjih skal apnenca, grušča, peska in ilovice. Na njih so zmerno izprana rjava pokarbonatna tla in plitva rjava pokarbonatna tla.

Diagnostična kombinacija rastlinskih vrst
Drevesna plast: navadna smreka (Picea abies), bukev (Fagus sylvatica), bela jelka (Abies alba).
Grmovna plast: Clematis alpina, Daphne mezereum, Lonicera nigra, Rosa pendulina, Rubus idaeus.
Zeliščna plast: Adenostyles glabra, Anemone nemorosa, Aposeris foetida, Athyrium filix-femina, Avenella flexuosa, Calamagrostis arundinacea, Cardamine trifolia, Carex pilosa, Chaerophyllum hirsutum, Cirsium erisithales, Deschampsia cespitosa, Doronicum austriacum, Euphorbia carniolica, Galeobdolon flavidum, Gentiana asclepiadea, Hacquetia epipactis, Hieracium sylvaticum, Homogyne sylvestris, Luzula pilosa, L. sylvatica, Maiantheum bifolium, Melampyrum sylvaticum, Mercurialis perennis, Oxalis acetosella, Phyteuma spicatum, Polygonatum verticillatum, Ranunculus lanuginosus, R. platanifolius, Senecio ovirensis, Symphytum tuberosum, Vaccinium myrtillus, Valeriana tripteris, Veratrum album, Veronica urticifolia.
Mahovna plast: Ctenidium molluscum, Dicranum polysetum, Eurhynchium striatum subsp. zetterstedtii, Fissidens cristatus, Polytrichum formosum, Rhytidiadelphus loreus, R. triquetrus, Tortella tortuosa.

Kot v vseh mraziščnih smrekovih gozdovih je obnova gozda dolgotrajen proces. Po goloseku se bujno razvijejo trave, predvsem Calamagrostis arundinacia, C. villosa, Deschampsia cespitosa in druge, ki za daljše obdobje zavrejo razvoj v smeri prvobitnega smrekovega gozda.

To so enodobni smrekovi gozdovi mraziščnega tipa s 50 do 70 % sklepa. Čeprav dosegajo precejšnjo lesno zalogo, je njihov gospodarski pomen zaradi slabše kakovosti lesa zmanjšan.

Asociacijo smreke in navadnega tevja uvrščamo v zvezo Vaccinio-Piceion.

The Hacquetio–Piceetum is an azonal forest association of karst depressions that depends on the microclimate and is located at an altitude of 1,050 to 1,250 meters. The diverse relief varies from the flat, gently inclined bottoms of depressions to medium steep slopes. The geological bedrock consists of moraines containing limestone rocks, gravel, sand, and loam. Above the parent material , there is chromic Luvisol and shallow chromic Cambisol.

Diagnostic combination of plant species
Tree layer: Picea abies, Fagus sylvatica, Abies alba.
Shrub layer: Clematis alpina, Daphne mezereum, Lonicera nigra, Rosa pendulina, Rubus idaeus.
Herb layer: Adenostyles glabra, Anemone nemorosa, Aposeris foetida, Athyrium filix – femina, Avenella flexuosa, Calamagrostis arundinacea, Cardamine trifolia, Carex pilosa, Chaerophyllum hirsutum, Cirsium erisithales, Deschampsia cespitosa, Doronicum austriacum, Euphorbia carniolica, Galeobdolon montanum, Gentiana asclepiadea, Hacquetia epipactis, Hieracium sylvaticum, Homogyne sylvestris, Luzula pilosa, L. sylvatica, Maiantheum bifolium, Melampyrum sylvaticum subsp. sylvaticum, Mercurialis perennis, Oxalis acetosella, Phyteuma spicatum, Polygonatum verticillatum, Ranunculus lanuginosus, R. platanifolius, Senecio ovirensis, Symphytum tuberosum, Vaccinium myrtillus, Valeriana tripteris, Veratrum album, Veronica urticifolia.
Moss layer: Ctenidium molluscum, Dicranum polysetum, Eurhynchium striatum subsp. zetterstedtii, Fissidens cristatus, Polytrichum formosum, Rhytidiadelphus loreus, R. triquetrus, Tortella tortuosa.

As with all frost site spruce forests, the regeneration of these forests is a long process. After clearing there is a lush development of grasses, in particular Calamagrostis arundinacea, C. villosa, Deschampsia caespitosa, and others, which makes the development of the spruce forest impossible for a long time.

These are even-aged spruce forests in the frost sites, and the tree layer covers from 50% to 70%. Although these spruce forests achieve abundant growth, they are of minor economic importance due to the inferior quality of the timber.

The Hacquetio–Piceetum is classified in the alliance Vaccinio–Piceion.

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Zupančič M. 1980: Smrekovi gozdovi Evrope in Balkanskega polotoka, I. Biološki vestnik 28(2): 137–158.
Zupančič M. 1999: Smrekovi gozdovi Slovenije. Dela SAZU 36, 222 s.