Notes on certain species of Pterostylk 



hi; 



including rather a wide sinus of 70-80 deg., produced into long 

 filamentous caudae almost equal in length to the dorsal sepal. 

 Labellum considerably longer than column, curved forward in its 

 distal fourth so as to protrude through the sinus of conjoined 

 sepals ; rather blunt, lanceo-spathulate ; traversed throughout its 

 upper surface by a longitudinal ridge very prominent in its anterior 

 half, with a corresponding groove on lower surfaee of the lamina ; 

 upper surface of lamina convex on transverse section ; appendage 

 densely penicillate. Column ahout J as long as labellum, wings 

 hatchet-shaped, upper lobe toothed and ciliated, lower lobe obtuse 

 and ciliated. Stigma rather narrow, oblong-lanceolate, point 

 upwards, lower end rounded. The following table shows the chief 

 points of distinction between this plant and P. cucullata, Br. : — 



1'. falcata 



P. cucullata 



Plant 

 Basal leaves 



Bracts 



Flower 



Galea 

 Conjd. Sepals 



Labellum 



Column 



Stigma 



Time of flower- 

 ing 



5-9 inches, slender 

 Not crowded ; not un- 

 usually large ; rarely 

 exceeding lj inches 

 Ovary rarely included 

 in upper bract 



Very large, often 2 ins. 

 (without ovary) ; gla- 

 brous; green and 

 white 



Produced into long point 

 Lobes tapering into fila- 

 mentous antennae; 

 sinus 70 Q -80° 

 Lanceo-spathulate 



Much shorter than label- 

 lum 



Narrow, long, oblong- 

 lanceolate 



October and November 



2-10 inches, stout, often dwarfed 



Generally crowded; often 3-3. > 

 inches; generally wider and 

 blunter than in P. falcata. 



Ovary usually included in up- 

 per bract ; larger, wider and 

 more leaf-like than in P. 

 falcata. 



Not exceeding li inches (with- 

 out ovary) ; pubescent; gen- 

 erally green dorsal sepal with 

 chocolate petals, labellum 

 and lateral sepals. 



Acute or shortly acuminate. 



Lobes tapering into short, sharp 

 points ; sinus 35°-4(T. • 



Oblong -elliptical or narrow- 

 elliptical. 

 Quite as long as labellum. 



Broad, short, ovate-lanceolate 



or elliptical. 

 A ugust and September. 



I have seen specimens of this plant from the following Victorian 

 localities : — 



Upper Yarra (Chas. Walter). 

 Orbost (E. E. Pescott). 



