Macrochloa tenacissima

Macrochloa tenacissima View in CoL (Loefl. ex L.) Kunth ( Figure 53 View FIGURE 53 (1)).

Lemma dorsal surface (including base): Characterised by rectangular long cells of (40–) 60–100(–140) × (10–) 14– 20(–22) µm, sinuous walls 7–11 µm thick, linear distribution. Short cells: Silica cells 16–21(–26) × 14–20(–24) µm, circular to ovoid, frequent, solitary or in pairs or threes with cork and ioccasionally hook cells, situated between long cells, density (8–)10–14(–15) silica cells/100 µm 2; Cork cells (5–)8–15(–19) × 14–20(–22) µm, sub-quadrangular, reniform to fusiform, sporadic, always with a silica cell. Spines and hairs: Hooks circular to ovoid (frequent) base (17–)20–28(–32) × 8–12(–14) µm high, irregularly distributed between long cells, frequently solitary, sporadically in pairs with silica cells, density <2 hooks/100 µm 2; Prickles circular to ovoid base (20–)24–30(–34) × 19–27(–29) µm, and up to 20 µm long, irregularly distributed between long cells, solitary, density <1 prickle/100 µm 2; Macro-hairs 600–900(–1100) µm long, circular to obovate base 20–26(–28) × 18–20 (–24) µm, irregularly distributed across entire surface, denser at base.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area. Short cells: Silica cells equal in size and morphology, distributed solitarily, in pairs, threes or occasionally a four-cell union with cork cells, hooks and prickles, at lower density (6–)8–10 silica cells/100 µm 2 than in dorsal area; Cork cells of equal size, morphology, distribution and density. Spines and hairs: Hooks of equal size, morphology and frequently with silica cells, denser than in the dorsal area 4–6 hooks/ 100 µm 2; Prickles of similar base morphology and size than in dorsal area, up to 40 µm long, distributed at the middle of the apex, density 2–4 prickles/100 µm 2; Macro-hairs up to 1000 µm long, circular to ovoid base 14–25(–27) × 12–18(–21) µm, distributed at middle of apex. Stomata paracytic, rare in middle of apex.

Material studied: Morocco: Jerada, -203628/ 3433318, 1170 m.s.a.l., 10-IV-2019, M . Chambouleyron ( ECWP s.n. (HSSrf 289(1/2)); Taourirt, 1180 m.a.s.l., 29-IV-2019, M. Chamboleyron, ECWP n.n.