The Species of the Genus Larix. 103 
something between the reddish-brown, stout shoots of the Ja- 
panese Larch, and the light-coloured, slender shoots of the 
European species. 
In the seed-bed, one-year plants of L. Kaempferi are 
distinguishable by being considerably smaller than those 
of L. decidua, and in this particular too the one-year 
hybrid plants occupy an intermediate position. 
From the forestry point of view, the European Larch 
has a better shape, but is, upon the other hand, extremely 
susceptible to the attacks of Dasycypha Willkommit, which 
the Japanese Larch is not. The hybrid combines the good 
shape of the one and the powers of resistance against 
canker of the other, and is therefore now the subject for 
larger experiments in forests. The second and third hybrid 
generation has also been raised, and is now being experi- 
mented with. 
In Denmark, one specimen is known from Dr. BorGE- 
SEN’s garden at Hellebæk, and young plants of L. Kaempferi 
from various Danish forests show signs of being hybrids 
with L. decidua. 
Herb. Mat. examined: 
Buffalo Park, Murthly, Scotland, 1923, J. M. Murray (2 samples). 
— Scotland, 1923, J. M. Murray. — Dunkeld, Scotland, September 1926, 
C. SYRACH Larsen. — Denmark, the Garden of Dr. BørGEsEn at Helle- 
bæk 1925, C. H. OsTENFELD. — Denmark, Strødam, near Hillerød 
(specimens sent from Scotland). 
The reciprocal cross, Larix decidua X Kaempferi, has 
been observed in the Frijsenborg Forest District, where 
the first hybrid generation was planted as one-year plants 
in 1925. The seed was collected from a 90—100-year-old 
L. decidua in »Frijsenborg Lystskov«, where the Japanese 
Larch stands a little to the west and south-west of the 
former. The seed yielded only a minimum of hybrids, the 
