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0344 Southern Tibet : vol.6
Southern Tibet : vol.6 / Page 344 (Grayscale High Resolution Image)

New!Citation Information

doi: 10.20676/00000263
Citation Format: Chicago | APA | Harvard | IEEE

OCR Text

*Potamogeton tubulatus* Hagstr. nov. sp.

Caulis tereo-subcompressus basi ramosus; anatomia: Ep. + Fasc. subep. debiliss.
v. OO + O-end. + cc circ. Folia uniformia pusilloidea linearia, 35 × 0,75 mm., trinervia,
sat valde mucronata, basi fere rotundata, biloc. Nervus medius lacunatus, laterales
obscuri ab ipso apice folii sat distanter confluentes; venæ transversales perpaucæ
obscuræ. Ligulæ connatæ, apice rotundatæ, 5—7 mm. longæ, in intercarinali parte
5—7-nervatæ. Turiones iis *P. panormitani* simillimi, sed sine foliis patentibus. Fructus
non visus.

*Pamir*, stagnant water and spring near Yeshil-kul, 3800 m., 2nd Sept. 1894 (sterile).

This new species is very like *P. pusillus*, but it differs in the following respects:
the sheaths, the turiones, the tips of the leaf-blades with more distinct mucro, the
rounded blad-bases and the anastomosing lateral nerves. From *P. panormitanus* it
is more difficult to distinguish, but the sheaths are few-nerved, the turiones without
patent leaves, the tips of the leaves more rounded, the leaves lacunose; the main-
nerves of the leaves are of the same shape as in *P. pusillus*, and the sclerenkyma
is more faintly developed, besides it has the habit of *P. pusillus*. (Note by the Rev.
O. HAGSTRÖM.)

*Potamogeton filiformis* Pers., Synops. I (1805) 152; Ascherson und Graebner,
l. c., 126; Hagström, in Kgl. Sv. Vet. Akad. Handl. 55 (1916) 14.

Eastern *Pamir*, Little Kara-kul, 3720 m., 17th July 1894 (flowering).

var. *linipes* Hagstr., in Bot. Notis. (1905) 142; in Kgl. Sv. Vet. Akad. Handl. 55
(1916) 17.

*Tibet*, without locality.

var. *tibetanus* Hagstr., l. c. (1905) 142; (1916) 19.

Eastern *Pamir*, Tjakker-agil, freshwater lake, 3319 m., 22nd July 1895 (sterile);
spring at Bulun-kul, 3405 m., 23rd July 1895 (sterile); lower Basik-kul, 3727 m.,
23rd July 1894 (flowering); Basik-kul, 3727 m., 21st July 1894 (sterile).

Northern *Tibet*, Upper Kum-köl, freshwater lake (Camp XVI), 3882 m., 28th July 1900.
*Geogr. area* (of the species): Cold and temperate regions of the northern hemisphere.

*Potamogeton rostratus* Hagstr., in Kgl. Sv. Vet. Akad. Handl. 55 (1916) 27.

Northern *Tibet*, Temirlik, Camp VII, 2961 m., 10th July 1900 (flowering).
*Geogr. area*: Mongolia.

*Potamogeton recurvatus* Hagstr., in Kgl. Sv. Vet. Akad. Handl. 55 (1916) 37;
*P. filiformis* Hagstr., in Bot. Notis. (1905) 141; not Pers.

S. E. *Tibet*, small somewhat brackish lake near Camp XIV, 4968 m., 28th Aug.
1896 (sterile); Eastern Tibet, Camp LXVI, in a lake, 26th Aug. 1901; lake, 4674 m.,
12th Sept. 1901; Camp LXXVIII and Camp LXXIX, Naktsong-tso, a little freshwater