I 



KtTNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 131 



P. ligulatus n. sp. 



Caulis alius, subteres, ramosus, internodiis elongatis (8 — 6cm). Folia biformia, 

 superiora coriacea lanceolata, laminis 30 — 50 mm longis, longe petiolata, petiolis 30 — 70 

 mm longis, apice et basi sensim attenuata, 7 — 13-nervia, submersa angnstissime line- 

 aria, 70 — 130 X 0,75 mm, in apicem sensim attenuata. Ligulce demum 30 — 40 mm 

 longae, persistentes, juniores 18 — 25 mm longse, fissse, apice rotundatse, in spatio 

 intracarinali 5-nervi8e. Pedunculus subteres crassiusculus 35 mm longus. Spica 4 — 5 

 verticillata, verticillis approximatis. Fructus ignotus. 



This species differs from P. javanicus by its long-stalked floating leaves, the 

 structure of the submersed leaves, and its long ligules. The form of the apex of 

 the submersed leaves is that of P. subjavanicus or javanicus (see figs. 56, B and 

 58, A), but as to the nervation they are 5-nerved even in the very top. It seems 

 to be a near relation to P. quinquenervius but differs by the above properties. Espe- 

 cially the sheaths are characteristic. 



The anatomy is noteworthy. Beside the usual mechanical sj'stem of the stem 

 (subepid. strands + pseudo-hyp. + 0-end.) there appear in the bark 2 bundles, one 

 on each side of the stele descending from the ridges of the strong ligules (cf. figs. 

 4, str, 51, E*). These carinal strands should be regarded the first constituents of 

 the ligular circle of the bark, usual in species with strong sheaths (cf. figs. 13, sir, 

 62, E, 75, C, str). The peduncle has not only the usual central bundles and scattered 

 subepidermal strands but even a full circle of cortical strands, by which the species 

 shows a close relationship to the more coarse-grown species. In fact, P. Ugulatus 

 is in its upper part the coarsest of the Javanici known to me. The submersed leaves, 

 however, are very narrow and delicate. They are endowed with 2 rows of lacunae 

 and several pairs of thin nerves as said above. The stem-leaves are 5-nerved in the 

 apex, by which they differ from all the other Javanici. 



Distribulion. Auslralia, N. S. W, Centennial Park, coll. J. H. Maiden (hb. 

 Hauniense). 



P. javanicus Hasskarl. 



Retzia sive observationes botanicse etc. in Act. Soc. Indo-Neerland. I, 1856, 

 26—27. — P. tenuicaulis F. Muller, Fragm. Fl. Austr., I, 1858, 90, 244. — P. 

 parviflorus Buchenau, Reliqu. Rutenb. in Abh. Naturw. Ver. Bremen, VII, 1880, 

 32 — 33. — P. Hicillensis Welw^itsch ex Schinz in Schweiz. Bot. Ges. I, 1891, 61. — 

 P. octandrus Reichenbach ap. A. Bennett, Bemerkungen etc. in Annalen Nat. Hof- 

 mua. Wien 1892, 288. — Fig. 58. 



This species is, according to the original description, richly branched in a dicho- 



tomous way {herhca dicholome ramosissimas), which scarcely can mean anything 



else than that the stem prolongs itself dichotomously by spike-bearing branches of 



