222 fHE AUSTRALIAN NATURALIST. 
in diameter, are pure white, in a somewhat crowded raceme at 
the top of the stem. 
Pterostylis grandiflora. Mr. Forster has painted this from 
Bankstown specimens. I have not seen it in that locality, but 
I collected it a few years ago at Northwood and Longueville. 
The Bulladelah plant is superior to any I saw on Lane Cove. 
The flower is larger, the galea broader and of a deeper red 
brown. In colour and form it is the most. beautiful Pterostylis 
I know. 
Spiculoea irritabilis. In Maiden and Betche’s Census of 
N.S.W. plants (1916) this is listed as Drakaeu irritabilis 
(Reichenbach). Dr. Rogers informs me that Lindley’s name, 
Spiculoea, has been restored to it, Drakaea being now restricted 
to a few Western Australian species. S. irritabilis is not un- 
common in late autumn on the lower western slopes of the 
Alum Mountain. It is a fascinating plant, with its curious 
hammer-like labellum, wonderfully articulated so as to strike 
down on the pollen masses. The plant has been described as 
leafless or possessing one radical leaf. This is a mistake. There 
are from two to four (most frequently two) well developed 
radical leaves somewhat resembling those of Chiloglottis diphylla. 
They are, however, imperfectly developed while the plant is 
flowering, and are at that stage often absent. 
‘Microtis oblonga. It is not easy to distinguish the various 
species of Microtis, but it is certain that they are more numer- 
ous than has been supposed. WM. oblonga is a species described 
and named by Dr. Rogers, who placed in it some Bulladelah 
specimens I sent him as M. parviflora. Besides the structural 
peculiarities described by Dr. Rogers, this species in the Bulla- 
delah district grows taller than any other (up to 2 feet), and 
in bright weather is quite strongly scented like Boronia mega- 
stigma. 
VARIATIONS. 
The following are brief notes, indicating the variations 
mentioned in the earlier part of this paper. 
Dendrobium kingianum. Typical form light or dark pink; 
variety pure white, rather rare. 
Dipodium punctatum. Typical form exactly resembling 
that common about Port Jackson. Varieties: (1) A more 
robust plant with light green stem; flowers almost mauve, very 
faintly marked with red. (2) A very slender form with a dark 
stem; sepals and petals outside pink spotted with red; inside 
very dark red, sometimes with a few pink blotches. 
