July, 1928 
The (Queensland Naturalist. 
7 S 
tiary age, but this, though probably correct, also calls for 
further field work. The rhyolite shows in a very perfect 
degree the banding and splierulitic structures character- 
istic of this type of rock. 
As already mentioned, the basalts cap all the higher 
hills, and a view of them from any of the summits can 
leave no doubt that they once have all been part of the, 
one great lava field, and are now only separated by the 
valleys cut in it by the streams. On a former occasion 
I suggested that these remarkable parallel streams, sep- 
arated by high basalt-capped divides, owed their parallel- 
ism to an origin on the evenly sloping surface of the lava 
flow. It was interesting to observe Back Creek running 
this parallel course, with the Nerang on one side and the 
Coomera on the other, but still largely on top of the 
basalt of Beeclimont, and more than 1000 feet above its. 
neighbours on either hand. 
(c) Botanical Njotes. 
By D. A. HERBERT, M.Sc. 
The camp was pitched in a patch of open forest by 
the creek on a moist flat where the eucalypts and box 
tree's were of relatively large size. Near at hand was a 
small patch of rain forest, but as usual the species in each 
formation did little trespassing on each other’s territory. 
Several orchids, Cymbidium suave, Dendrobium aemulum, 
D. teretifolium (the pencil orchid) and D. linguif orrne (the 
tongue orchid), were found growing as epiphytes in the 
open forest. The life of an epiphyte in this formation 
is rather precarious, and the great majority of rain 
forest types do not grow on open forest trees. It seems 
more than likely that the species mentioned represent a 
relatively unsuccessful attempt at colonization from the 
rain forest. Cymbidium, the most successful, occurring 
as it does in quite dry open forests, has succeeded largely 
as the result of rooting in hollow branches and trunks; 
in effect it has therefore become almost terrestrial. A 
ground orchid found in bloom was Dipodium punctatum, 
growing in the open forest. It! is of interest in being 
almost leafless and obtaining its organic food material 
from, the soil through the agency of a fungal partner. 
Morchella deliciosa, an edible fungus, was collected, 
but was not common, -only two specimens being found. 
The Jew’s ear (Hirneola auricula-judae), used by the 
