Stipa mediterranea (Trin. & Rupr.) Asch. & Graeb.

Vázquez, Francisco Maria, Márquez, Francisco, García, David & Oualidi, Jalal El, 2025, A taxonomic revision of Stipeae s. l. tribe (Poaceae) in N Africa, Phytotaxa 699 (1), pp. 1-174 : 101-102

Stipa mediterranea (Trin. & Rupr.) Asch. & Graeb. ( Figure 57 (2)).

Lemma dorsal surface: Characterised by long rectangular cells of (12–)20–51(–58) × (7–)10–16(–18) µm, sinuous walls up to 5 µm thick, linear distrubution. Short cells: Silica cells of 7–14 × 7–10 µm, circular, obovate to oblong, frequent with cork cells and in pairs or threes with hook cells, situated between long cells, occasionally solitary; Cork cells (3–)5–8(–9) × 8–12 µm, sub-reniform (fewer) to fusiform (frequent), with a silica cell (frequent). Spines and hairs: Hooks sub-quadrangular to circular base (8–) 10–19(–21) × 5–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica or cork cells, occasionally solitary, density 10–14 hooks/ 100 µm 2; Macro-hairs> 570 µm long, circular base 10–18(–20) µm, regularly distributed in lines from mid-dorsal to base of lemma.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area, slightly longer, up to 110 µm long, sinuous wall up to 6.5 µm thick. Short cells: Silica cells of 5–11 × 7–12 µm, similar distribution and morphology to the dorsal area; Cork cells (2–)3–7 × 7–12 µm, oblong to sub-reniform (fewer), of equal distribution to the dorsal. Spines and hairs: Hooks circular base 9–18 µm, similar density to dorsal area 9–14 hooks/ 100 µm 2; Prickles absent; Macro-hairs of obovate to circular base, up to 390 µm, located at margin up to apex.

Awn base surface: Characterised by long cells of acute to oblique apex up to 430 µm in twisted, flat and angled parts. Short cells absent. Spines and hairs: Hooks absent; Prickles Angular types, with oblong to lineal base of 9–14 × 4–6 µm and up to 7 µm tall; Macro-hairs absent. Stomata paracytic (Parallel-sided subsidiary cells type), of linear distribution on flat parts and in grooves between twists, density 50–90(–120) stomata/ 1 cm 2.

Material studied: Spain: Huesca: Purroy de la Solana, 10-VII-1990, F. M . Vázquez, HSS0056874 ; Lérida; Conques, 11-VII-1990, F. M . Vázquez, HSS0056856 .

Figures

FIGURE 57. Lemma surface Stipa atlantica. (1). Stipa mediterranea (2). A. Lemma central dorsal surface view. B. Lemma margin dorsal surface view. C. Lemma apex. D. Awn surface. lc. Long cell. sc. Silica cell. cc. Cork cell. h. Hook. p. Prickle. mh. Macro-hair. s. stomata. Bars indicate 100 µm.