Stipa letourneuxii var. tunetana F. M. Vazquez

Stipa letourneuxii var. tunetana (H. Scholz) F.M.Vázquez (Figure 63 (3)). Lemma dorsal surface: Characterised by sub-quadrangular to rectangular (fewer) long cells of (16–)18–24(–28) × 16–22 µm, smooth walls up to 11 µm thick, linear distribution. Short cells: main Silica cells 9–14 × 17–21 µm, circular to oblong, sporadic, frequently in pairs or threes with hook cells, situated between long cells, occasionally solitary; Cork cells 4–8(–9) × 17–20 µm oblong to fusiform, sporadic, in all cases with a silica cell and occasionally a hook cell. Spines and hairs: Hooks circular to oblong base 16–24 × 6–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica, or additional hook cells, more frequent solitary, density 8–10 hooks/100 µm 2; Prickles not studied; Macro-hairs up to 380 µm long, circular base (9–)11–16 µm, regularly distributed in lines from base to mid-dorsal surface. Lemma apical surface: Characterised by long cells similar to those of the dorsal area, thinner and more numerous, size (9–)11–37 × 7–10 µm. Short cells: Silica cells of equal size and morphology to the dorsal, more frequent; Cork cells equal in size, distribution and morphology to the dorsal. Spines and hairs: Hooks equal in size and morphology to the dorsal, irregular in distribution and of higher density (18–26 hooks/100 µm 2); Prickles circular to ovate base, 20–24 × 19–28 µm, 35–88 µm long, distributed at middle and distal parts of apex; Macro-hairs ovate to circular base 22–28 × 24–33(–35) µm, and up to 360 µm long, distributed at upper apex. Material studied: Tunisia: Chahbania, near to Neffatia, 10°53′E, 33°15′N, IV-1996, M. Visser, HSS 11860; Close Taguelmit, 11°13′E, 32°59′N, IV-1996, M. Visser, HSS 7428.