. Critical researches on the potamogetons. KUNGL. S\'. VET. AKADEMIENS HANDLINGAE. BAND 55. N:0 5. 75 This species has been sometimes intermingled with P. pusillus L. and consi- dered a variety of it (thus Kunth, Enum. Ill, 1841, 137). Later authors have certainly thought it to be a proper species but included it with the pusillus-gvou-p as nearly related to that (thus Raunki^r, Anat. Pot. Stud. 1903, Fischer, Gree- ner). Almovist has (1889) put it together with P. zosterif. and acutifolius, indi- cating thereby a more correct view, although even he has held it to stand very near to P. pusillu
. Critical researches on the potamogetons. KUNGL. S\'. VET. AKADEMIENS HANDLINGAE. BAND 55. N:0 5. 75 This species has been sometimes intermingled with P. pusillus L. and consi- dered a variety of it (thus Kunth, Enum. Ill, 1841, 137). Later authors have certainly thought it to be a proper species but included it with the pusillus-gvou-p as nearly related to that (thus Raunki^r, Anat. Pot. Stud. 1903, Fischer, Gree- ner). Almovist has (1889) put it together with P. zosterif. and acutifolius, indi- cating thereby a more correct view, although even he has held it to stand very near to P. pusillus, which ex Almqvist includes also P. gracilis Fr. A closer observation of all parts of the plant shows the fructifica- very close to that, respecting tions, it stands P. acutifolius, and as to the ve- getative organs it draws extreme- ly near to P. rutilis. But the ligules are open and by this pro- perty it reminds of the Pusilli convoluti. The structure of the ligule, again, is very like that of P. javanicus. Its distribution area coincides for the greater part with that of P. acutifolius, but expands much more south- wards through Africa. The stigma is depressed, oval, much wider than the upp- er surface of the style. Style very short, ovary broad, com- pressed. A ripe fruit in longi- tudinal section shows quite the same appearance as the fruit of P. acutifolius. The inside boss lies in the prolongation of the partition wall (see fig. 29, B). The flowers of the two species are also like in usually having. Fig. 29. P. ti'ichoides Ch. & ScHL. A, Pistil, a, lateral view, t*, from be- hind, 6, stigma from above, y. B, Longitudinal sections of ripe fruits of diiferent size and form, «, 6, y. C, Transverse section of a stem-leaf, middle part, us, lower surface, I, lacunar system, str, bast-bundles, ^y. D, Basal portion of a stem-leaf, 'f. E, Top of the same, V. F, Top of an involucral leaf as it sometimes is met with, midrib, n\ lateral nerves. G, Innermost leaf of a turio, \
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1916
