KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 85 



are of the same thickness. Epidermis-cells 4 — 5 times as long as broad; endodermis, 

 lacunar system, and central stele just as in the coordinate. 



Leaves with low midrib and slightly developed lacunar system in contradistinction 

 to P. sibiricus Bbnn. possessing a broad median areolation-area. Bast-bundles and 

 vascular bundles as the fig. shows. The chief lateral nerves join the midrib in the 

 very apex especially in the involucral leaves, which are also a little more obtuse than 

 the lower ones, but always lacking the lacunous structure, which is characteristic to 

 part of the Pusilli. 



The style is very short and the stigma expands over the border of the style. 



The species differs from P. sibiricus Bbnn. by the stem being narrower, the 

 ligules brown, the spike 6 — 8-florous, and by the absence of the leaf-areolation men- 

 tioned above. Fruit not seen. 



The material examined originates from Sibiria, Yenesei, Dudinka, G9° 35' n. lat, 

 coll. H. W. Arnell, 1876 (hb. Stockholm); Nikandrovskij ostrov, 70° 20' n. lat., in 

 a small lake, 76 V (flowering), Arnell (hb. Stockholm.). P. subsihiricus may belong 

 to the tundra-lakes of north-west Sibiria, whereas P. sibiricus may have a more 

 easterly distribution. 



Subsectio 12. Monticoli Hagstr. 



Gaulis teres v. subteres, peduncuHs valde elongatis. Folia angustissime linearia, 

 uninervia, laete viridia, in apicem tenuissimum subobtusum longissime attenuata, per 

 totam latitudinem loculosa. Ligv.lce fissse, binervise, in spatio intercarinali enerviae. 

 Pistillum stylo brevi, stigmate parvo. Fructus subglobosus dorso carinatus, lateri- 

 bus levis. Operculum angustum, carinatum. 



Dr. C. Raunki^r is the first that has established the »P. conjervoides-gvovi^y> 

 (Anat. Pot. Stud., 268) because of the lack of subepidermal bast-bundles in the bark 

 of the stem. Prof. P. Graebner, again, has reunited the species with the Pusilli. 

 The species, however, deserves its particular position not only because of the above 

 remarked condition, but also on account of the stem-hypoderma, the structure of 

 the leaves and ligules, the different central cylinder of the stem and peduncle, the 

 fruit etc. 



Its distribution-area is rather narrow: the north-east parts of the United States 

 of America. 



P. coiifervoides Reichenbach. 



Icones Fiorse Gerraanicje et Helveticae etc. Vol. VII, 1845, 13. — P. Tucker- 

 mani Robbins ap. A. Gray, Manual of the Bot. of the north. U. S., 1856, 434. — 

 P. monticolus Schweinitz ap. Ar. Benn. in Ann. naturh. Hofmus. Wien, 1892, 292, 

 nomen solum. — Fig. 1, G, 34. 



As the P. polygonus, respecting the development of stem-sclerenchyma, forms 



