HO 0. Hagström: Potamogetonaceae asiaticae. 



lataeque, acutiusculae. Retinaculum crassum, 0,4 — 0,45 mm longum: pars 

 dimidia superior ab externa parte visa, late ovata, circiter 0,25 mm lata, 

 apice rotundata v. obtusissima, basi subtruncata, inferior multo angustior, 

 inferne emarginata. Caudiculae (generis) usque 0,18 mm longae. Pollinia 

 ovalia, circiter 0,7 mm longa, 0,45 mm lata, utroque apice rotundata. 

 Stigma planum v. concavum. Polliculus crasse fusiformis v. ovoideo- 

 fusiformis, circiter 10 cm longus, apice acuminatus, sat crebre villosus 

 et tuberculis altis, acutis, sparsis munitus, Semina numerosa, (submatura) 

 tenuia, ovalia, circiter 7 mm longa, usque 5 mm lata, sublaevia. late 

 marginata, margine integerrimo, coma Candida usque 4 cm longa. 



Argentina: Cördoba in viciniis urbis, pluribus locis (1877. E. Hie- 

 ronymus no. 723. Dec. 1883. C. Galander. — Variis annis. Stuckert 

 no. 4208, 7737, 7925, 10671). Floret praecipue mensibus Nov. et Dec. 



Ob coronam duplicem forsan haud sit hujus generis; sine dubio 

 tarnen ei affinis est, et ad interim hie collacavi. Recedit etiam pedun- 

 culo aliquantulum elongato, floribus majoribus, foliis tantum in nervis et 

 praecipue subtus pilosis, ceterum glaucescentibus etc. 



XXV. 0. Hagström: Potamogetonaceae asiaticae. 



(Nach: Bot. Not., 1905, pp. 141 — 142.) 



1. Potamogeton pectinatus L. var. coronatus Hagström, 1. c, p. 141. 

 Caulis laxus filiformis internodiis subelongatis (5 — 10 cm). Fnlia 



linearia angustissima, caulinia et inferiora ramorum mucronata. Spica 

 saepius multiverticillata (vertic. 5—8,. vulgo 5 — 6). Fructus parvus, 

 3X2 mm. dorso rotundato. 



"Muntjokk-ott 23 juni Mapiek-köll" (leg. Sven Hedin). 



Fruiting speeimen; only its upper part preserved. Stern slender, 

 thin (1 mm in diam.), bi'anched. internodes 5 — 10 cm. Leaves narrow 

 (1 mm; on the branches 1 / 2 mm only). acute: stemleaves and lower branch- 

 leaves cuspidate. Sheaths with membranaeeous border. Stipules half as 

 long as the sheaths. Peduncles 5 — 10 cm in length. Spikes of 5 — 8 

 (usually 5 — 6) sections. Fruit small, 3X2 mm, back rounded (dry with 

 a low keel on the back below). 



The anatomy of the stem like that of the European forms: endodermis- 

 cells strongly onesided thickened, spread bastbundles (11 observed in a 

 transverse section at the middle of the stem) in one circle in the bark, 

 central cylindre compressed (transv. sect. oval). The small drupelets make 

 this form easily recognizable. 



2. Pot. filiformis Pers. var. Tibetanus Hagstr., 1. c, p. 142. 



Folia linearia (1 mm lata) aequali fere latitudine usque ad apicem,. 

 apice breviter rotundato vel saepe triangulari. Vaginae longae (25 — 30 mm). 

 "Öt're Kum-köll. N. Tibet" (leg. Sven Hedin). 

 Only 3 individuals collected of which 2 steril and one flowering, no fruit. 



