1580 CXXVII. OKCHIDE^. [Acianthus^ 



undivided, the margin entire, the disk smooth or papillose, with or without 2^ 

 adnate calli or tubercles at the base. Column erect or incurved, semitereteor 

 2-winged. Anther broad, erect, 2-celled, with broad outer valves, the connective 

 sometimes produced into a short point ; pollen granular, but less so than ini 

 Caladenia and more distinctly collected into 4 masses in each cell. — Terrestrial' 

 glabrous herbs, with small underground tubers. Leaf solitary, immediately 

 above the basal scarious sheath or higher up the stem, broadly ovate-cordate. 

 Flowers solitary or several in a terminal raceme, on a scape or stem without 

 scales above the leaf, except the small bracts subtending the pedicels. 



A genus of few species, nearly allied to Caladenia, but without the calli and fringes to the 

 labeilum of that genus and a different foliage. 



Column not winged. Sepals with fine points. Labeilum oblong-lanceolate. 



Flowers 3 to 10, Dorsal sepal with a point under 2 lines. 

 Dorsal sepal ovate-lanceolate. Labeilum with 2 papillose lines on the 



surface 1. A. fornicatus.. 



Dorsal sepal lanceolate, contracted at the base. Labeilum smooth on the 



surface 2. A. exsertus. 



1. A. fornicatus (arched), R. Br. Prod. 321 ; Bentlu Fl. Austr. vi. 370- 

 Stem slender, 6 to Sin. high. Leaf at the base or below the middle, broadly- 

 ovate or orbicular, deeply cordate and stein-clasping with broad rounded 

 auricles, usually 1 to IJin- long, sometimes sinuate or even rather deeply 3-lobed.. 

 Flowers 4 to 10, on short pedicels ; bracts ovate or lanceolate, acute. Dorsal 

 sepale ovate-lanceolate, 3 to 4 lines long, erect, incurved, concave, acute and the- 

 midrib produced into a fine point of 1 to If line ; lateral sepals nearly as long 

 but linear, with a long point and angular or toothed on each side of the point, 

 close together or shortly united under the labeilum ; petals lanceolate, about half 

 as long as the dorsal sepal, with a short point. Labeilum much shorter than the- 

 dorsal sepal but variable in length, nearly sessile or on an exceedingly short 

 claw, obloiig-lanceolate, acuminate, concave at the base with 2 very short raised= 

 longitudinal plates or calli, smooth along the centre with 2 very prominent broad 

 raised papillose lines parallel to the reflexed margins, the point smooth. Column 

 not too lines long, much incurved, semiterete, not winged, often concealed in the 

 dorsal sepal, but sometimes bent forward as in A. exsertus. Anther with a very 

 short point. Pollen-masses 4 in each cell, of the somewhat solid consistence of 

 Eriochilus but obtuse at the base. Stigma very prominent. — Lindl. Gen. and Sp.. 

 Orch. 397 ; Endl. Iconogr. t. 16 ; Reichb. f. Beitr. 25 ; Fitzg. Austr. Orch. i.,. 

 Pt. 1. 



Hab.: Brisbane Elver, Moreton Bay, F. vi Mueller ; Eockingham Bay, Dallachy ; Mount. 

 Wheeler, Thozet. 



2. A. exsertus (protruding), R. Br. Prod. 321 ; Benth. Fl. Austr. vi^ 

 370. A slender delicate plant, much resembling A. fornicatus, but smaller. 

 Leaf deeply cordate, ovate or orbicular and often sinuate as in that species^ 

 Flowers rather smaller, 3 to 6 in the raceme, the pedicels very short. Dorsal 

 sepal slightly incurved, concave, but narrow and much contracted at the base,, 

 about 3 lines long, including the short point ; lateral sepals almost subulate ; 

 petals lanceolate, about half as long as the sepals. Labeilum nearly as long as- 

 the sepals, oblong-lanceolate as in A. fornicatus but on a more distinct claw, the 

 raised plates at the base rather longer and the surface of the lamina smooth or 

 with very few papillee in 2 rows. Column slender, not winged, about half as long 

 as the sepals, incurved and protruding forwards from the dorsal sepal. Pollen 

 of A. fornicatus. — Lindl. Gen. and Sp. Orch. 397 ; Hook. f. Fl. Tasm. ii. 25 t 

 119 ; Reichb. f. Beitr. 25; Fitzg. Austr. Orch. i. Pt. 1. 



Hab.: Between Stanthorpe and the border of N.S.W. 



