250 DR. K. DOMIN ON THE 
Micnoris, R. Br. 
М, PorRIFOLIA, Spreng. (Bentham, vi. 347). 
W. Australia: Cranbrook usque Warrungup, in planitie arenosa, coll. A. 
A. Dorrien-Smith, 1909, cum Triglochine procera, quie cum ea in speciminibus 
siccatis mixta primo aspectu haud dissimilis apparet. 
Eodem loco el. A. A. Dorrien-Smith formam M. porrifolir collegit, que 
folio pro specie crasso stricte erecto racemum superante, racemo angusto 
laxo longiuseule acuminato notabilis est, sed florum structura a typo haud 
discrepat. 
PrEROsTYLIs, A. Br. 
P. nana, FR. Br. (Bentham, vi. 857). 
W. Australia ; Mt. Toolbrunup, coll. A. A. Dorrien-Smith, 1909. 
Speciminibus P. nane, R. Br. et P. pyramidalis, Lindl. (Bentham, I. c.) 
copiosis examinatis et comparatis persuasum mihi habeo formam hane tantum 
varietatem P. nanc bracteis caulinis magis foliaceis insignem sistere. Alteram 
differentiam constantem eruere nequeo. P. nana var. typica foliis radicalibus 
rosulatis, caule scapiformi pro more graciliore et humiliore bracteaque unica 
vaginante instructo, P. nana var. pyramidalis statura robustiore, foliis minus 
conspieue rosulatis in bracteas caulinas haud ad vaginas reductas sed foliis 
similes sensim abeuntibus excellit, sed florum structura in specie utraque 
nulla nota majoris pretii discrepat. Bentham (l. c.), Diels (Fragm. 119), 
O. H. Sargent (Orchids oceurring in York, Journ. West Austr. Nat. Hist. 
Soc. p. 11, 1906) et alii auctores P. pyramidalem pro specie sui juris habent, 
sed iam apud cl. Ferd. Mueller (Remarks on some Victorian Orchids, Wing’s 
‘Southern Science Record,’ September 1882) scriptum legimus : ** Whether 
the West Australian P. pyramidalis is really distinct from P. nana seems 
very doubtful, inasmuch as its difference mainly rests on the expansion of 
the lower eauline bracts into leaves, transit forms occurring at Port Phillip 
in this respect." 
Озу. Н. Sargent, seribit l. e. : * Both these doubtfully distinct forms 
occur here: typical nana flowers in September ; it usually occurs in moist 
sandy soils: a form with more or less rosulate leaves, but a stouter and 
more hairy plant, with larger flowers than typical nana ; flowers in June, 
various soils : typical pyramidalis flowers in November ; it grows in mud in 
the river-bed." 
LvrERANTHUs, R. Br. 
L. nigricans, 2. Br. (Bentham, vi. 364 ; Diels, Fragm. 120). 
Forma typica: W. Australia: Slab Hut Creek usque Cranbrook, coll. A. 
A. Dorrien-Smith, 1909. 
