Beiträge zur OrchideenJcunde. 



11 



junction with the hypochil, and just above the concave ribbed base 

 of epichil. Mr. H. G. Reichenbachs Paradisanthus , with which I am 

 unacquainted, would seem to be also a genus related to this. 



Acacallis cyanea Lindl. 



Sepala et petala subrotunda, apiculata, basi cuneata. Hypochilii 

 Saccus margine acute quinquedentato auctus, mesochilii processus recti, 

 subulati ; epichilium transversum , subtrilobum , denticulatum , basi late 

 cuneatum, concavum, lobo medio minuto acuminato integerrimo. Co- 

 lumnae alae membranaceae quadratae. Glinaudrium dorso cornutum. 

 Anthera membranacea, ecristata. 



This is a very fine plant, with the habit of a Maxillaria of the 

 racemose section, and with flowers as large as those of Odonto- 

 glossum Pescatorei. Mr. Spruce reports the sepals and petals to be 

 light blue, paler -within: the lip light bluish purple with pale veins; 

 back and wings of column streaked with red. He adds, that the blue 

 of the flower is perfectly pure. The leaves are three inches broad, 

 by fifteen inches long, with much the texture of a Stanhopea; at the 

 base they gradually taper intro a furrowed petiole three inches long. 

 The pseudobulb is ovate, and oneleaved. The peduncle, including 

 the close five-flowered raceme, is about a foot long. 



Wild in Brazil ; Barra of Rio Negro, on trees by forest streams, 

 ' Jul. 1851. Spruce. 1780 (v. s. sp.). 



Diese höchst interessante Pflanze habe ich zunächst in Lindley's 

 Herbar eingesehn. Darauf habe ich .sie in dem Herbar zu Kew gezeichnet 

 und analysirt. Dabei hat Ikh Lindley's Vermuthung wohl bestätigt, dass seine 

 Beschreibung der Pollinia einem abnormen Exemplare entlehnt wurde. Min- 

 destens glaube ich diess erschliessen zu dürfen, nachdem der Pollenapparat 

 der von mir untersuchten Bliithen Pollinia zeigt, welche mit denen der nor- 

 malen Aganisia pulchella gänzlich übereinstimmen. Das Resultat meiner Unter- 

 suchung ist, dass Acacallis in keinem wesentlichen Punkte von Aganisia abweicht. 



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