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MH. MOOUE on some SlTPBASOEIFEBOrS FEBNS. 



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Note on some Supraatoferous Ferns 



MOOKE 



[Read 



Y. 



The normal condition of the majority of the Ferns, as is well known, 

 18 to produce what is called their fructification, on the under sur- 

 face or the back of their fronds, and hence they are called dorsi- 



There are, however, some remarkable deviations from this 



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rule among the Ferns which belong to the dorsiferous class. 

 ^ Some time since, in the " Nature- Printed Ferns of Great Britain 

 md Ireland;' I had occasion to mention the fact, that certain 

 vaneties of the common Hart's-tongue Fern {Scolopendrium vuU 

 $^re)^ habitually produce sori on the upper as well as the under 

 surface of their fronds. This occurs, for the most part, on those 

 varieties, several in number, in which the margin is crenately 

 lobed. In these cases, it often appears as if the normally-placed 

 son had been continued so as to reach the margin at the acute 

 smuses of the lobes, and then returned on the opposite surface; 

 out it also frequently happens that the abnormally-placed sori are 

 distinctly within the margin, and borne where there are no cor- 

 responding son beneath, - .- 

 ^ Subsequently another example of this kind has Deen recorded ^ 

 "7 oir vv. Hooker*; — an aspidioid suprasoriferous Polypodium 

 loundin Ceylon. I have now to mention a still more r 



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able instance, occurring in a totally difierent group of ferns, in 

 ^hich the fructification is normally marginal- . 



Some time ago I was favoured hy my friend Mr. C. Moore, the 

 Director of the Botanic Garden at Sydney, with some fronds, cul- 

 tivated in the Sydney garden, of one of the Ferns he had obtained 



from New Caledon 



ia. This fern, named after him Beparia Moorii 



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y Sir W. Hooker t, I have ah-eady, under the name of CionidiumXf 

 brought under the notice of the Society as forming a Dep«frioid 

 genus, with reticulated vdins. Departa normally bears its spore- 

 ^**®^s within little cup-like involucres, standing out from the ex- 

 ti^me margin of the fronds on little footstalks, and the same kind 

 of structure occurs in Oionidium. In the specimeus of Cionidium 

 'V^orii^ above referred to, these normally-placed marginal exserted 

 son were abundant ; but in addition to them were other perfect 

 8ori scattered here and there, feoth on the "^^upper ^a^^^ under sur- 

 *^^, entirely removed from the marg^nf sometimes even almost 



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^w Journal of Botany: viiL 360, t. 11. 



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f Ibid. ir. 55, t. 3. 



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t Proc^sedings bf the Linnean Society, ii. 212. 



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