ZZ7 

 CONTRIBUTIONS TO THE ORCHIDACEOUS FLORA OF AUSTRALIA. 



By R. S. Rogers, M.A., M.D. 

 - [Read October 11, 1923.] 

 Plate XXVIl. 



Caladenia cristata, n. sp. 



Planta gracilis, hirsuta, circa 30 cm. alta ; folium lineare, circiter 10 cm. 

 longum, hirsutissimum ; bractea subulata ad medium caulis. Flos solitarius. 

 Sepala subaequalia, circiter 2 cm. longa; dorsale lanceolatum, erectum, incur- 

 vatum; lateralia latiora, acuminata, patentia. Petala circiter 15 mm. longa, 

 sepalis angustiora. Labellum breviter unguiculatum, mobile, cordiforme, apice 

 recurvo, circiter 8 mm. longum, marginibus integerrimis ; calli stipitati, atro- 

 purpurei, clavati vel lineares, confertissimi, in lamina forma cristae mediae 

 instructi, prope apicem terminantes. Columna subaequilonga labello, incur- 

 vatissima, in dimidio superiore late membranaceo-dilatata. 



Western Australia: Murchison District, Dr. E. S. Simpson, September, 

 1923. 



A slender hairy plant about 30 cm. high; leaf linear about 10 cm. long; 

 a subulate appressed stem-bract about the middle and a shorter acuminate bract 

 below the flower pedicel. Flower solitary ; segments of perianth yellowish- 

 green, with a central reddish stripe ; sepals subequal, the dorsal one erect incurved 

 lanceolate about 2 cm. long, the lateral ones wider acuminate spreading; the 

 lateral petals linear-lanceolate, much narrower than the sepals, about 1'5 cm. long. 

 Labellum reddish-brown, spreading, mobile on a short claw, cordiform, the 

 extreme apex shortly recurved, margins entire ; lamina with divergent red vein- 

 ings ; calli on long ciliated stalks, crowded into a conspicuous rather narrow dense 

 crest along the centre, extending from the claw almost to the apex, the extremities 

 purple bilobed near the claw clavate towards the centre of the disc and more or 

 less linear near the apex. Column almost equal in length to the labellum, much 

 incurved and very widely winged in its upper half. 



This very striking and characteristic species approximates in the shape of 

 its column and in the arrangement of its calli to Caladenia plicata, Fitzg., but 

 differs from that species in the absence of clubbed sepals and fringed labellar 

 margins. In my specimens the margins of the labellum are revolute, possibly 

 due to deterioration of the flower during the journey. The calli do not appear 

 to be arranged in definite rows as in C. plicata, but are crowded into a dense dark 

 purple central band, which stands conspicuously erect on the lighter-coloured 

 disc. The specific name has reference to the crested appearance of this band of 

 calli. 



I am indebted for my specimens to Mrs. Pelloe, the well-known flower artist 

 of Perth. 



Prasophyllum Colemanae, n. sp. 



Planta robustiuscula, 30-40 cm. alta ; spica circiter 8 cm. longa, laxiuscula. 

 Flores lavandulacei vel lilacini, circiter 21, pedicellis perbrevibus ; ovaria brevia 

 turgida. Sepalum dorsale subviride, circiter 7 mm. longum, oblongo-lanceolatum, 

 concavum, erectum vel recurvum, apice acuto; lateralia viridia, libera, divaricata, 

 patentia, circiter 8 mm. longa. Petala lavandulacea, obtusiusculis apicibus, 

 patentia, 7 mm. longa, 175 mm. lata. Labellum lavandulaceum, subaequilongum 

 sepalis lateralibus, late ovatum, subsessile, complanatum, in medio leviter 

 recurvum, marginibus crenatis ad apicem ; pars callosa tenuis, subviridis, paulum 

 ultra flexum producta ; pars membranacea perlata. Columna brevis, laciniis 

 oblongo-f alcatis obtusibus rostello brevioribus ; caudicula longuiscula. 



