. Dansk botanisk arkiv. Plants; Plants -- Denmark. 470 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. H. secunda as nothing else but two forms of the same plant. This opinion I founded on the fact that the supposed difTerent ramifi- cation, being the only real difference between them, would not be proof against a thorough examination of more extensive material, and this point of view, that the ramification in itself is not a suf- ficient character of distinction, 1 still maintain, at any rate, to a certain degree. Nevertheless, I have now come to the conclusion that we have to do with two different speci

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. Dansk botanisk arkiv. Plants; Plants -- Denmark. 470 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. H. secunda as nothing else but two forms of the same plant. This opinion I founded on the fact that the supposed difTerent ramifi- cation, being the only real difference between them, would not be proof against a thorough examination of more extensive material, and this point of view, that the ramification in itself is not a suf- ficient character of distinction, 1 still maintain, at any rate, to a certain degree. Nevertheless, I have now come to the conclusion that we have to do with two different species, my conclusion being based on the fact that 1 have succeded in finding two very different types of anthe- ridial plants, so different that they necessarily must be regarded as belonging to two distinct species. Had these two difi"erent types shown diverse forms of rami- fication we might perhaps by means of this have been able to refer plants with other fructiferous organs, tetraspores and cystocarps to their respective species. But this was not the case, both plants being ramified with some differences in a rather pecuhar way which seems to be characteristic of the male plants. If we now leave out of consideration the ramification as a character of distinction between the two species and look upon the other differences between them mentioned in the descrip- tions we find that the most essential one is that H. tenella is a more slender plant than secunda. Taking this into consideration I now refer the most robust form of the antheridial plants found to Herposiphonia secunda^ the other to H. tenella^). 1) The third West Indian form, H. Pecten-veneris (Harv.) Falkenb. is, I think, nothing else but a form with recurved branchlets and summits of branches.. Fig. 428. Herposiphonia secunda (Ag.) Falkenb. a, transverse section of anthe- ridial stand, b, apex of branchlets with antheridial stands in difTerent stages of development, c part of a male plant. (a, b, about 200:1; c

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