Kačasta smreka (Picea Abies) je posledica mutacije dednih zasnov. Je izjemno redka, v Sloveniji je znanih ene 10 primerkov. Gozdarji jih v sodelovanju z lastniki ohranjajo po svojih močeh.
V primerjavi z navadno smreko njene veje niso ravne, marveč vijugaste, dolge in rastejo nepravilno v vse smeri. Iz debla izraščajo najprej naravnost, nato pa se malce povesijo in so skoraj brez stranskih poganjkov; redke veje drugega reda so pogosto docela povešene. Iglice so nekoliko daljše (do tri centimetre dolge), močnejše in trše kot pri navadni smreki, poganjek ščetkasto obraščajo z vseh strani, spodnje iglice so pogosto srpasto ukrivljene navzgor. Z iglicami so običajno obrasli samo mlajši konci vej v dolžini do enega metra.
Undulating spruce (Picea Abies) is result of mutations of genetic identity. It's extremely rare in Slovenia - one of 10 known specimens. Foresters in cooperation with the owners are doing best to keep it alive.
Compared with simple pine branches are not straight, but wavy, long and grow irregularly in all directions. From trunk are growing down straight first and then slightly sloping and have almost no side-shoots; few branches of the second order are often completely drooped. The needles are slightly longer (up to three centimeters long), stronger and stiffer than spruce, shoot are fouling on all sides, bottom needles are often sickle curved upwards. The needles are usually overgrown just under the ends of the branches in the length of one meter.