KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 27 



vascular bundles appear in this lacunar tissue. Inward the cortex is confined by a 

 M-endodermis. The central cylinder is four-bundled just as in P. filiformis which 

 does not very distinctly differ from it. Cf. fig. 2! 



Distribution. Chile, Desert. Atacama, 84, Philippi (hb. Stockholm.), of very 

 low growth; Argentina, Jujuy, 01, Fries (hb. Stockholm.), 4,300 m s. m. Patagonia, 

 territ. Sta Cruz, 09, Skottsberg. 



Var. magellaniciis n. var. 



Caulis 30 — 50 cm altus, internodiis inferioribus 4—5 cm, superioribus 6 — 7 cm, 

 subteres, flexilis, ramosus, ramificatione ut in P. filiformi. Folia badeo- vel fusco- 

 viridia ± canaliculata rotundato-obtusa ± rotundato-carjnata, 3-nervia, vaginis badeo- 

 marginatis ± 30 mm (iis ad folia flor, 20 mm) longis, ligulis 15 ram retusis mem- 

 branaceis, folia caulina infima 2 mm, superiora 2—1,75 mm lata, 100 mm longa, ramea 

 summa 100—150 mm longa vaginis 30 — 50 mm longis. Pedunculus 80 mm; spicaflorens 

 10 — 15 mm, fructifera 35 mm, 4— 6-verticillata. Stylus brevis, stigma humile rotun- 

 datum. Pollen sphseroideum. Fructus iis formse primarise similes. — Fig. 7, C — D. 



The variety differs from the type by its higher stature, stouter stem, below 2 

 mm in diam., broader leaves, longer, and broader sheaths. Flowers somewhat larger 

 than for instance in P. filiformis, leaves more conspicuously keeled than in the type 

 having a bast-bundle subepidermally in the margins (fig, 7, C, ski.). The stem has a 

 circle of 6 — 8 bast- and vascular bundles in the cortex, a 2-layered pseudo-hypoderma 

 and no subepidermal strands. Central cylinder terete with 4 cavities (4 — 8-bundled). 



Just as the typical form is extremely like P. filiformis, the variety also is 

 similar to x P. suecicus f. Kerneri m. and was accordingly at first determined by me 

 as P. juncifolius when this plant was considered a true species. It can, however, 

 even without fruit, easily be distinguished from the hybrid through the more uni- 

 form leaves, the topmost leaves scarcely being narrower than the basal ones. The 

 leaves taper very slightly towards the tip and appear more lacunous, the lacunse 

 being shorter and their bottoms more approached to each other which appears to the 

 naked eye, when the leaf is held against the light. The transverse section of a leaf 

 shows also, that the leaf is more canaliculate and faintly keeled, to which may 

 be added that the lateral nerves are more removed from the margins, each being 

 provided with a microscopical bast-bundle. Pollen spheric, of large grains (or of 

 middle size). 



Distribution. S. America: Tierra del Fuego septentr., Gente Grande, 96, P. 

 DuSEN »n. 280 PI. in regione Magellanico lect£e» (hb. Uppsal.); Territorio Chubut, 

 Lat. S. 44° 0', Long. W. 70° 30', rivulet 02, Hogberg (hb. Stockh.). 



P. rostratus n. sp. 



Caulis humilis a basi ramosus filiformis badeus, internodiis mediis longioribus. 

 Folia angustissime linearia viridia vel fuscoviridia loculosa 3-nervia, nervo laterali 

 in margine situ ut in P. filiformi, brevissime subacuta vel subcuspidata, canaliculata, 



