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



31 



dine, ramosus ita ut nulla vagina foliorum caulinorum duos ramos primae et secundae 

 ordinis ± evolutos non amplectat, ramis summis spicam saepe superantibus. Folia 

 fusoo-viridia tenuia subplana 3(5)-nervia striata angustissime linearia (0,5 — 1 mm), 

 inferiora brevia, superiora sensim in longitudine crescentia (ca. 10 cm), omnia obtusa 

 apice praesertim in floralibus subretusa. Vagince badeo- vel fusco-virides badeo-mar- 

 ginatse fissa3 subelongatae, summse 2—3(4) cm longse, ligulis tenuibus 7 — 10 mm longis. 

 Pedunculus tenuissimus teres flexilis 10—15 cm longus. Spica 6 — 7— (8)-verticillata 

 fructifera 35 mm longa internodiis brevibus sequilongis (ut in P. vaginato). Stylus 

 subnullus, stigmate rotundato, in fructibus verrucelhe simili persistente. Frucius 





Fig. 10. P. subrefitsus Hagstu. A, Top of an involacral leaf, showing the conrse of the small soperficial nerves (mechanical 

 strands) and the way in which the lateral nerves join tho midrib, 2 1 5 . B, Transverse section of a stem-leaf (middle part) a, 

 b — b, chief nerves, str, snbepidermal strands, l, lacunsB, \°. C, Transverse section of the stem's axial stele (4-bnndled diagram), 

 a, two bigger median bundles with intereellnlar channels (j), b, lateral bnudles, \°. I), Spike, -}. E, Fruit with the slight, persisting 



stigma, lateral view, f. F, Frnit, crosscnt-form. 



maturus 2,5 mm longus 1,5 mm latus, oblique obovatus, lateribus planis vel subcon- 

 vexis, dorso bisulcatus, stigmate subfaciali. — Fig. 10. 



The epidermis of the stem consists of long, narrow cells; inside there are a 

 few circles of air-channels, the larger outvvard, the narrower inward, as usual. Five 

 to six ligular strands have been observed in the cortex grouped, as usual, into one 

 circle in the angles of the channel-walls. Endodermis of w-cells, though not very 

 much thickened and inside this a complexure of vascular bundles in four groups 

 (four-bundled) with two (1—4) wide intercellular channels. The crosscut-form of the 

 central cylinder a little compressed with mechanical tissue only along the endodermis. 



If already the rather numerous cortical strands of the stem suggest affinity 

 to the species of this section, the leaf-structure shows much more conspicuously such 

 an affinity. Beside the very strong marginal nerves there are between these and 

 the middle nerve subepidermally two or three (dependent on the leaf-width) mecha- 



