рег) 
ПТ. Contribution to the Lichenographi of New South Wales. 
By CHARLES Кхтойт, F.L.S. 
(Plates УП.-ТХ.) 
Read March 2nd, 1882. 
THE Lichens to which the following descriptions relate form part of a collection made 
by me in the neighbourhood of Sydney *. I was led to make the collection on receiving 
the interesting paper of the Rev. Mr. Crombie on the Australasian Lichens in Robert 
Brown's herbarium +. І ат not aware that any other papers on the Lichens of New 5. 
Wales have been published. Several of the species included in the present paper are of 
considerable interest, especially those arranged under the genus Stigmatidiwm. 
The Lichens coilected in the neighbourhood of Sydney, New 8. Wales, are interesting 
in the variety of new species, and in their raising important questions of classification. 
Т have thought it best to give drawings of the spores of all the Lichens which are new 
or interesting. The descriptions are rather full, in order to meet the requirements of the 
two schools of lichenologists. Characters which would be ample for the followers of 
one school would be quite inadequate for the others. But where drawings are given of 
any structure or part, it is not of much importance which school may eventually gather 
within its folds the great body of observers; and we may reasonably hope, with Dr. 
Beale, in ‘How to work with the Microscope,’ that those who follow us will look at our 
drawings, if we are careful to make honest copies of nature. Some of the spores are 
beautiful objects under Ше microscope—for instance, those of Lecidea callispora (sp. n.) 
and Platygrapha albo-vestita (sp. n.). Others furnish excellent specific differences, as in 
those of the several Stigmatidia; while the extreme length of the spores of Verrucaria 
rhaphispora (зр. п.) render it impossible to confound that Lichen with any other Austra- 
. lian Verrucaria. The measurements given are those of the normal size of spores in situ. 
Generally, in the young ascus, the spores would be somewhat less in size; on the 
other hand the dimensions would occasionally be found above the average if the spores 
free in the field of the microscope are taken. In respect of the spores of Bacidie, and 
especially in the case of Lichens whose spores, comparatively speaking, are of huge 
dimensions, as in some Pertusaria, Ochrolechie, &c., the variations in size are much 
more frequent, especially in length, and may differ widely from the average. I have 
made no use of chemical reagents. A classification eminently natural should not in any 
way be founded on a chemical basis. Тһе chemical properties of a Lichen may doubtless 
+ A set of the Lichens is deposited in the Kew Herbarium; and another has also been forwarded to the Rev. W. 
A. Leighton, Shrewsbury. 
t Journ. Linn. Soc. Botany, vol. xvii. pp. 390-401. 
SECOND SERIES.— BOTANY, VOL. II. 
