Макарова, О. А. Фенологический атлас растений / Н. В. Поликарпова, О. А. Макарова ; М-во природ. ресурсов и экологии Рос. Федерации, Федер. гос. бюджет. учреждение «Гос. природ. заповедник «Пасвик» ; [худож.: Хохлов В. А. ; пер.: Кислова О. С.]. - Рязань : Голос губернии, 2016.

Descriptions of principal plant phenophases 209 ‘green tip’ or ‘green cone', begins when the tight leaf primordia become visible underneath protective scales. Leaf bud expansion is recorded when ‘burst’ buds expose green leaf tips, but the leaves are still tightly rolled and packed together. In coniferous plants, the tips of young needles emerge from papery scales. 2. BEGINNING OF LEAF UNFOLDING, LEAF EMERGENCE International phase code BBCH 11 (Growing stage.., 2001; Meier et al., 2009) Phase description First leaves have unfolded or fully expanded. As leaves begin to unfold, greenish mist on trees becomes visible from afar. The phase is deemed to begin on the day when 10% of plants on the route have entered the phase. In conifers, leaf emergence is considered to begin on the day when young needles appear, needle tips separate. Further info Beideman I. N. (1974): ‘Green tip' in buds is observed when bud scales begin to open, move apart, and paler strips become visible. A swollen bud begins to break, scales separate, and green tips of young leaves show at the apex. Trees appear as if covered in greenish mist. Fenolog .rgo.ru : Leaf emergence (‘greening’), expansion - quite well separated small leaves with heavily corrugated leaf blade, stalks (peti oles) not yet visible, the tree has turned green. The phase lasts from the first buds with separating and unfolding leaves (from a distance a tree appears as if in obscure greenish ‘mist’) to ‘ruffling’ of all buds, where leaves have separated noticeably (from a distance a tree appears as if in obvious greenish ‘mist’), but there are no completely separate leaves yet. Terentjeva E. Yu. (2008): Bud ‘ruffling’ -leaves have begun to separate, but aren't yet fully unfolded. Leaf emergence (‘greening’) - leaves are unfolding and gaining recognizable shape, but may still be wrinkled, sticky, reddish or otherwise colored. Active leaf growth is underway. Sinel'nikova N. И and Pakhomov M. N. (2015): Beginning of leaf unfolding is determined by the appearance of burst buds with leaves still tightly