146 ON THE HUON PINE, &c. 
Yet that number and their relative size are so variable as con- 
siderably to diminish their value as a diagnostic mark. The 
ternary arrangement of the seeds, much dwelt upon by Brong- E 
niart, as typical of the Australian form, is a striking and. 
prominent character in our Cape species, whose seeds are Y 
hardly winged. The tuberculated receptacle is not con … 
stant in the Australian species, nor are the scales of the — 
cones always alternately smaller. The wings of the seeds 
differ much in size, some being quite as broad as those 
of Callitris or Pachylepis; the seeds themselves are not 
always osseous; one species of the latter genus having the 
seed much more osseous than any Australian Callitris, and 
almost wingless. I have not been able hitherto to detect 
any difference, except that they bear three anthers or pollen- 
thecæ, between the male amenta of Callitris and Pachylepis, 
though Brongniart suggests that such may exist. The leaves 
of the Cape species are sometimes decussately opposite, and 
regularly so throughout a great part of the branches ; those 
of the northern plant are arranged in fours, and of the Aus- 
tralian in threes. The latter is the most remarkable number 
amongst Conifere, and is accompanied with two coty ledons, 
which is also the case in one species of the Cape Pachylepis: 
The pollen grains in Callitris, Frenela, and Pachylepis, ue 
small, spherical, transparent, perfectly smooth spheres, with 
an irregular, darker nucleus; in a young state they appear 
more flattened, resembling disks, and are larger. The ee 
Tasmanian species belong to Brongniart's genus Frenela, its 
most evident character lies in the ternary arrangement of the 
leaves. Spach rightly supposes that these, in a young state, 
are acicular, like those of Thuja, &c. 
1. C. australis, Br.; strobilis glomeratis solitariisve breviter 
pedunculatis globosis (magnitudine coryli avellanæ), v% 
vis lignosis crassis late ovatis valde obtusis v. sub-acut? 
levibus v. longitudinaliter rugosis, receptaculo vix rugoso» 
columna centrali brevi tricruri vel nulla, seminibus ossels 
late ovatis alarum marginibus membranaceis. 
* Oyster-Bay Pine,” incolarum. 
