RECORD: Darwin, C. R. [1876?].09.01. The long-projection on Labellum surprisingly thick & sweet pleasant taste. CUL-DAR70.131. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 9.2021. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR70 contains material for Darwin's book Orchids (2d ed. 1877).


[131]

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Sept 1. The long-projection on Labellum surprisingly thick & sweet pleasant taste - the so-called nectary has not thin walls & no doubt answers to cavity; the difference is that it lies close to column. It is impossible to understand how disc, with upturned end rests. In this species the hinge is elastic & the pollinia springy, to one side & rests on little upturned end of disc - no doubt this hinge & elasticity replaces hygrometric movement & we know from Crüger that the p. lies flat on insects Bees back. - Plant has lost its irritability, so that no touching of antenna cause ejecting, but when pollinium mechanically disturbed, was ejected by the folding & stretching of pedicel & hit the bilobed end of long-projection of L.

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[132v]

Better not say anything about elasticity of Hinge, as I find that the weight of pollen-masses causes are attached p. to stand at ∠ to th object, when held in reversed position. I believe that the pollinia by dangling at hinge drop into stigma cavity of the ♀ & are then brushed hard against the edges of the stigmatic chamber, but I had better say nothng on this head.

(I must now add 1 more species to those examined)


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 25 September, 2022