332 Barber,— Cupressinoxy Ion vec tense. 
It is doubtful how far it is possible to separate the last two 
forms of wood. Strasburger states that resin-parenchyma is 
to be found in all Coniferous wood except that of Taxus 1 . 
Beust asserts that the frequency of resin-parenchyma cannot be 
used in classification, the only division possible being into those 
with and those without it 2 . Certainly its absence from a few 
sections of a fossil would not demonstrate its typical absence 
from the species. Thus Felix, examining a specimen described 
by Schenk as Cedroxylon , because he found no parenchyma, 
was compelled to alter its name to Cupressinoxy Ion 3 . 
It becomes very difficult to draw a sharp line between the 
two types because of the many transitional cases. In young 
branches of Cedrus Deodara and Cryptomeria japonica 
examined by myself, the number of wood-parenchyma-cells 
per sq. mm. of transverse section was greater in Cedrus 
than in Cryptomeria , being fairly abundant in both. Yet 
Cedrus is included in the Cedroxylon type and Cryptomeria 
is a typical Cupressinoxy Ion, 
Leaving out of consideration the collection of families in- 
cluded under Araucarioxylon , it is significant that Cupressino - 
xylon includes, among living forms, Cupressaceae, Taxo- 
diaceae, PodocarptLS , Dacrydium , Saxogothaea , Phyllocladus , 
Ginkgo , Abies Webbiana. The ‘genus’ therefore comprises 
the Cupressaceae in general as well as members of the 
Abietaceae, Taxodiaceae, and Taxoideae. Among Abietaceae 
are to be found genera or species belonging to Cupressino xylon 
and Pityoxylon , and among the Taxoideae are included Taxo - 
xylon and Cupressino xylon . 
These facts make it sufficiently clear that the character 
of the wood alone is of little taxonomic value. At the 
same time it cannot be altogether neglected. The section 
Pityoxylon offers characters distinct enough for determining 
1 Strasburger, Ueber den Bau und die Verrichtungen der Leitungsbahnen in den 
Pflanzen, Histologische Beitrage, iii, 1891. 
2 Beust, Untersucliungen liber fossile Holzer aus Gronland, Allgem. Schweiz. 
Gesellschaft, neue Denkschrift, xxix, 1884. 
8 Felix, Studien liber fossile Holzer, p. 29, Inaug. Diss., Leipzig, 1882. 
