| 英文摘要 |
In the July issue of Taiwania a report was made of the discovery of Isoetes from Taiwan (DeVol 1972: 1-7 ). It is now necessary to make a very important correction concerning the description of the megaspores of this new species. Isoetes taiwanensis DeVol belongs to the section CRISTATAE and not to section TUBERCULATAE. The megaspore has broken ridges on its basal s ide and tubercules on its other faces. Plate 1 figures 3 and 4 show two views of the megaspore. Pfeiffer lists only 2 species in his section CRISTATAE that have a 3-lobed corm, one is I. tripus A. Br. from Australia, the other is I. savatieri Franchet from near the south ern tip of South America (Pfeiffer, 1922: 176-177). T. taiwanensis differs from both of these in a number of respects but it can be readily distinguished from each of t hem by a single character: I. tripus has megaspores that arc dark when wet or dry and arc from 400 to 460 µ. I. satavieri has a velum that covers 1/3 to 3/ 4 of the sporangium. Our species seems to be nearer to I. sinensis Palmer than any other, however it lacks the 4 strong bast fibers, and the stomata are not numerous. |
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