Stipa offneri Breistroffer 1950

Stipa offneri Breistr. (Figure 64 (1)). Lemma dorsal surface: Characterised by rectangular to quadrangular long cells of (16–)25–50(–61) × 16–21 µm, smooth to undulated walls 7–9 µm thick in smooth walls to 10–14 µm in undulated walls, linear distribution. Short cells: main Silica cells of 10–14 × 18–24 µm, circular to oblong, sporadic in dorsal and frequent at margins, in all cases in pairs or threes with silica, hook and occasionally cork cells, never solitary; Cork cells 7–10 × 18–21 µm, oblong, sporadic, in all cases with silica cells. Spines and hairs: Hooks circular to quadrangular base 12–23 × 7–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica, cork or additional hook cells, more frequently solitary, density 12–16 hooks/100 µm 2; Prickles not studied; Macro-hairs up to 410 µm long, circular base 19–24 µm, regularly distributed in lines from mid-dorsal area to lemma base. Lemma apical surface: Characterised by long cells similar to those of the dorsal area, thin walled to 18 µm. Short cells: Silica cells of equal size, morphology and distribution, more frequent (12–15 silica cells/100 µm 2); Cork cells of equal size, morphology, distribution and density to dorsal. Spines and hairs: Hooks circular equal in size, morphology and distribution, denser than in dorsal area (14–18 hooks/100 µm 2); Prickles circular to ovate base 12–22 × 16–24 µm and (12–)14–55(–60) µm long, distributed at middle and upper parts of apex, up to 6 prickles/100 µm 2; Macro-hairs of circular base 12–24 × 110–400 µm long, located at distal part of apex. Material studied: Morocco: Tanda, VC 0021/4146, 1640 m.s.a.l., 29-V-2014, M. Chambouleyron (ECWP s.n. (HSSrf 227 (1/2/3))); Boumia, 0273583/ 3617960, 1910 m.s.a.l., 22-V-2014, M. Chambouleyron (ECWP s.n. (HSSrf 230)).