?*S??1 kwiUAw, htti'rtidai honmt oi Ktaf Hi-ad, 7uv 141 



RtrRKEXcr.s 



JSrVMrrr, J., and Pin**: K. 0. (1953). "Inlonidal Zoiuliou of the Exposed. 

 Kocky Shores of Victoria, Toother with a Rearrangement of the fit#>- 

 fieoftuiphtcal Provinces oi Temperate Australian Shores" .'Jim/, /. \/<?r. 

 .£ ! : rcshiv»l(>r IfywmnJL 1 it): 105-159. 



EiiWAiwfc A, ft < iO^l). "The NovuVWen Cwa*l of Tasmania." fVtfJ. KtfV. 



Guu.ek i£. ft. i lUSOl "The Intcrtidal Ecology oi Tasmania," Pop. Pror. 



RflJ, iVn\ Ttafcl, /••=" J&#; 135-201, 1%. !-!i, 

 fl95ia) !he Nature of intertidal donation in Tasmania." •>/'. 



at. $ jj.(5J 



• il°52b). "Thf Marine Al&ffl of Tasmania " op tl/. S6 71-106 



. 1 195-1). "The Intertidal ZonatitHi a| Two Place* lit Southern 



Tasmania." op. W/. 88: 105-1 i SSL 

 KtHsuMv, R. C, (1955a). ''Geological Observations oti the West Tamar " 

 i *ct, NoL 71 (9) 338-144. Maps 1-2 ( Tan j 



<i955l>). tm n lorn, *jjfr. cii. /J (10) : 153-15(5 (FcoA 

 (1955c). »W- <oncL, Dp. fiff. 7i </I> : 175-17'; (Mar) 

 U°55d). "A Systematic List of the Mollusca oi Tasmania " 

 Pap. Prar. R/>v. Saf, To/m.^t 289-355. 



DIURIS PALACHI1 A SPECIES OR HYBRID? 



By. \V t. Wo.uams 



Doubts mu« always . assai I Hie student uS Victoriau orcltids as Ui Hie validity 

 of Tlie *|K:cie> l)\wij pnhirhifn lingers l*)iiring the |>eTio*1 l*)*K-J4 I hi nil 

 the orchid on several occasions close to lite Grampians, chiefly in (be Pomona! 

 area_ There, it (Via invariably .associated with large displays oi DturU pedun- 

 culatti, with uti admixture" of Diurt.t mtuu{<rta. On all occasions, only one or 

 two spec inton? of Diurit pnlacklhi were found. 



Ouring- i\ vi^it 10 I aire Fya.n$ in early October 1956, T again came across 

 the orchid, in a £jx>t where Lhuris pedumjufota (the early, lemon-yellow form) 

 wjs abundant, and where I here were also several specimens of D>urts wiocv- 

 fata. One clump, consisting of five specimens, was observed, and a further 

 very doubtful' specimen occurred about B quarter of a mile away. These, speci- 

 iue>is could be divided mlo three groups lor purposes oli study, in the clump 

 referred to there were two stems of three flowers each which were in com- 

 plete agreement with published descriptions of D, pnhrhih, In the same 

 clump were three atoms of two flowers each which differed i« some respects 

 f/oiu tht fn^t group The lone specimen differed still Imtlier. 1 shall rotor 

 to specimem in each of these three categories as A, B, and C", respectively 



Specimen A had*the general fonu;Uion of Diurii prdwtmFaUt, but was of a 

 much n»orc- fioldeii yellow; the dorsal sepal *nd the labclluiu were marked 

 with brown blotclK-s or sj>ots, The InU'lhim veas of the l_ypie;d >prtde sluipe, 

 coming lu .i pronounced point, though not 50 Innfi or «t shandy pouileil ;U ihe 

 label) um of L>. pediwcuhta, The \&\$ pl.ile had tluee raised lines, the centrpl 

 one continuing as the central ridge of the tabellum proper, ;is heipt'cns in 

 /> f>erfu}irn?att7. The two outer lines, however, did not remain parallel 01 

 converge, as is characteristic of the last-named oichid, but diverged, a^ do 

 the tiwi lines tn D uttuufalu. The labelbim ivph dittded, as is the case ill both 

 O pftlmuufalit and D. u\ac\datu, into three, lobei. The two outer Lobes were 

 i.+CJiticul,tte. but ppich smaller than 'hose of D pedimculaUi. The lateral sepals 

 vier c parallel or slightly divergent. 



Specimen B differed in rhr following respect* : It wms lumon-ychow rather 

 ih^in golden. Exceiit lor a thin streak on cither aide of the saddle ridpe of 

 the label turn, it was innocent of brown markings. The labellum, though broad 

 mid generally 9|>;oJe-;diaped. did not come to a point ; in fact it was slightly 



