. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 249 Its nearest relation is, of course, P. dentatus, which differs by another, Zizii- like anatomic stem-diagram, more lucens-li^e nervation and shape of leaves, shorter petioles but longer cusps (± 10 mm each, in the stem-leaves), shorter (± 3 cm) ligules with higher ridges and smaller, gramineus-\i^e fruit »2 mm lon- gus, 1,75 mm latus complanatus suborbiculatus v. oblique obova- tus, rostro brevi subapicali, dorso siccus subcarinatus», see Hag- STEOM, New Potamogetons (Bot. Not. 1908, 101-102,
. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 249 Its nearest relation is, of course, P. dentatus, which differs by another, Zizii- like anatomic stem-diagram, more lucens-li^e nervation and shape of leaves, shorter petioles but longer cusps (± 10 mm each, in the stem-leaves), shorter (± 3 cm) ligules with higher ridges and smaller, gramineus-\i^e fruit »2 mm lon- gus, 1,75 mm latus complanatus suborbiculatus v. oblique obova- tus, rostro brevi subapicali, dorso siccus subcarinatus», see Hag- STEOM, New Potamogetons (Bot. Not. 1908, 101-102, fig. 4—6)! This species, again, differs but little from P. Gaudichaudii of Ladrone Islands, the original specimens of which are no more accessible (specimina originalia desunt: Graebner). But I have seen specimens from the very locus classicus: Guam, Agana Ri- ver, coll. by Mc Gregor, 1911 (hb. Haun.), that present stem- leaves with a shorter cusp and shorter ligules, 16-—18-flowered spikes, no cortical strands in the stem, except the ligular circle, and a cc. of the oblong type. Fruit not seen. P. malaianus prolongs itself by branches of as far as the 4th rank, but shows no tendency to develop coriaceous leaves. Distribution: Herb. E. Fries (hb. Uppsal.) contains a specimen without stated locality, but obviously identic with the Teysmann specimens, of Halma- haira. — Japan, Jokohama, 62, Maximowicz (hb. Stockholm., Petropol.); Tokyo, 84, Making (hb. Petropol.) — Mandshuria »Flumen Mudandsian, fl. Sungari infl. in rivulo Saling tun. Provincia Kitin», leg. V. L. Komarov (hb. Petropol.). — The distribution-area seems to be the Malayan and Japanese Archipelago and adjacent countries, where P. dentatus also obviously has its Fig. 115. A—E, P. malnianus MiQ. A, with appendant lignle, |. B, Pistil, sideview, 'j-. C, Frnit, sideview, °-^'. D, Part of the transverse section of stem, about Y, ep epidermis, lip, pseudo-hypoderma, ob, vase, bund-
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1916
