Betula pendula Roth

TEPBAPHfl QJIOPM CCCP,
H32ABAEMHa BOTAHHHECKHM HHCTHTYTOM hm. B. JI. KOMAPOBA
AKAflEMHH HAYK CCCP
NEW YORK BOTANICAL GARDEN
04359213
Z. %?
3384. Betula montana V. Vassil. sp. nova
Arbor. Cortex albido-subfuscus, ramentaceus. Ramuli hornotini ver-
riicosi, brunnei, ramuli annotini grisei vel atropurpurei. Petioli superne
adpresse pilosi, inferne glabri, 1—1.5 cm lg. Folia rhomboidea vel ovoideo-
rhomboidea, apice acuta vel subacuta, marginibus inaequaliter dentata
vel duplicatim dentata, 5—6-costata, coriacea, 3—6.5 cm lg., 2.5 cm It.,
supra glabra vel (rarius) ad nervos sparse pilosa, infra glabra et in angulis
nervorum barbellata. Amenta fructifera oblongo ovoidea vel subcylindrica,
1.3—1.6 cm lg., ad 1 cm lata, pedunculis pilosis, 0.5—0.7 cm lg. Squamae
¿amentorum fructiferorum 5—7 mm lg., 4—5 mm It., marginibus ciliatis,
utrinque sparse pilosae, lobis mediis angustis, subacutis, lobis laterali-
bus latioribus, superne truncatis vel rotundatis oblique sursum vergentibus.
Nuculae ellipticae vel oblongo ellipticae, 2—2.5 mm lg., 1—1.5 mm It.,
in parte superiore pubescentes; alae 1—1.5 mm It., nucula longiores.
A B. verrucosa Ehrh., quae similis, foliis 5—6-nervibus, amentis bre-
vioribus, squamarum formis valde differt.
,Zj(ocToitHo aaMe^aHHH, *ito HOBan 6epe3a, KaK h 6epe3H cemjHH Er-
mani, hbjihctch rop.HHM bh^om. Oco6eHHtiit HHTepec npejjCTaBJiHeT
cxoflCTBo c ceKi^Heft Ermani no TaKHM BaJKHtiM cHCTeMaTmecKHM npH3Ha-
KaM Kan $opMa npnuBeTHbix nemyit h HajiHHHe Sopo^OK b .yrjiax jkhjiok.
8to 06cT0HTejibCTB0 yKa3HBaeT Ha ^peBHne cb«3h rpymm 6epe3 THna Ver-
rucosae c TnnoM Ermani. PncKOBaHHO, kohc^ho, 6bijio 6m yTBepjKflaTb, hto
HOBLift bhji; npeflCTaBJiaeT nepexoflHyio CBfl3yK)nj,yK) $opMy b reHeTHHecKOM
CMHCJie cjiOBa, ho *ito oh HBjmeTCH nepexoaHHM Meatfly hhmh b Mop<J>ojio-
rHHecKOM 0TH0meHHH no paay npH3HaKOB, — 3to HecoMHeHHo; B TO me
BpeMS HMeiOTCH npH3HaKH, HanpHMep, KOJinqecxBO nap jkhjiok jiHCTa, no ko-
ToptiM B. verrucosa Ehrh. ÒJiHJKe k rany Ermani, HeweJiH B. Sukaczevii.
K cojKajieHHH) sjih Hac HeHCHBi $HJioreHeTHqecKHe OTHomeHHH Meatfly 6epe-
3aMH rana Verrucosae h 6epe3aMH THna Pubescens, xoth ohh othochtch k oahoh
ceKHHH (Albae Rgl.), Taii KaK npoH3pacTaiomaH b ropax Eojibmoro KaB-
Ka3a B. Raddeana Trautv. npeflCTaBJineT $opMy nepexoflHyio onaTb-TaKH
ot THna Ermani k THny Pubescens. Ecjih sto cxoactbo He rnòpHfloreHHoro
xapaKTepa, Tor,n;a nepefl h8mh flBa JiioSonbiTHbix npeflKa ot THna Ermani,
0TH0CHm;er0CH k apeBHeMy noapo^y po^a Betula — Costatae (Nakai)
V. Vassil. b oflHoft oÓJiacTH (b IIpH6aftKajibe) k pafly Verrucosae, a b flpy-
roft o6jiacTH (KaBKa3) — k pHfly Pubescens.
Ot B. verrucosa Ehrh. OTJiH^aeTCH jihctbhmh c MeHbmnM kojihhcctbom
jkhjiok (5—6), 6opo,n;KaMH bojiockob b yraax jkhjiok, 6ojiee kopotkhmh
cepencKaMH h nemyaMH, 60K0BLie JionacTH KOTopux HanpaBjieHH He bhh3,
KaK y B. verrucosa, a koco BBepx. B nocjie^HeM OTHomeHHH hobeiìì bha Hano-
MHHaeT 6epe3H H3 ceKHHH Ermani V. Vassil., c K0T0piiMH oh cxo«eH TaKJKe
HajiHHHeM b yrnax jkhjiok 60p0ff0K H3 KypnaBbix bojiockob.
H3 3Toro cjieflOBajio 6u npHTTH k 3aKJironeHHio o HeTBepTH*moM
npoHcxojKfleHHH ceKijHH Albae Rgl. Jip AajibHeimrax h 6ojiee ffeTaJibHHX
HccjieAOBaHHit cjieflyeT B03flepjKaTbCH ot KaTeropnnecKHX bhboaob.
B. H. B a c h Ji b e b.
3a6aftKaJibe. BacceftH BepxHe# AHrapu. Topa KnpeH, Bep-
xoBbe p. Hk^hx, 6jih3 BepxHefi rpaHHuti Jieca. Co(5p. B. H. C y k a h e b
h T. H. IlonjiaBCKaH. — Transbaicalia. Systema fl. Ver-
chnjaja Angara (Angara Superior). Ad fontes riv. Jaktschich. Prope margi-
nerei superiorem sylvarum. Leg. V. Sukaczev etH. Poplawska.
1912 VII 28 (VIII 10).
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