284 
On the Coniferce of Tasmania. 
XII. Phyllocladus, Rich. 1. P. aspleniifolia, Rich. 
“ Celery-topped Pine ” of Tasmania, and 2. P. trichomanoides, 
Don, the “ Tauehahd” of the New Zealanders. 
From the above list it will be seen that four genera are peculiar 
to the Southern Hemisphere, Araucaria, Phyllocladas, Micro- 
cachrys, and Athrotaxis. Three others have their maximum to 
the south of the tropics, Callitris, Podocarpus, and Dacrydium. 
Dammara has one species in each hemisphere. Thuja is equally- 
divided between the two; whilst Juniperus and Cupressus are 
barely, if at all, represented, except perhaps the latter by 
Athrotaxis. 
If we divide the regions which these Coniferce inhabit into four, 
namely, Australia, New Zealand, South America, and South 
Africa, it will appear that they are very unequally diffused, and 
that their relative abundance is not regulated by the extent of 
surface, which might be expected to be the case with a group 
composed of peculiarly local species. Only one of the genera is 
peculiar to them all, Podocarpus, it is in all respects the most 
widely diffused genus of Conifera, as it is one of the most exten¬ 
sive. Araucaria comes next, being found in three of the regions, 
Australia, New Zealand,* and South America. Thuja has been 
detected in two only, America and New Zealand; Callitris, 
including Pachylepis, in Australia, and Africa; Dacrydium and 
Pliyllocladus in Australia and New Zealand. Juniperus is con¬ 
fined to America, if indeed it really exists in the southern hemis¬ 
phere, and Athrotaxis and Microcachrys to Tasmania. 
In conclusion, I shall arrange the genera in the order of their 
relative abundance in the countries specified above. 
I. Australia is by far the richest, containing, as it does, 
seven genera, and probably twenty-six species, thus: Callitris 12, 
Podocarpus 6, Athrotaxis 3, Araucaria 2, Microcachrys 1, 
Dacrydium 1, Phyllocladus 1. It also exhibits the most striking 
coniferous vegetation, and is the only country possessing any two 
peculiar genera. 
II. New Zealand contains of Podocarpus 6, Dacrydium 3, 
Thuja 1, Phyllocladus 1, Dammara 1, Araucaria 1; six genera 
* 1 include Norfolk Island in the New Zealand division. 
