Macrochloa antiatlantica (Barreña, D.Rivera, Alcaraz & Obón) H. Scholz & Valdés, 2006

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 : 96

Macrochloa antiatlantica (Barreña, D.Rivera, Alcaraz & Obón) H. Scholz & Valdés ( Figure 53 (2)).

Lemma dorsal surface (including base): Characterised by rectangular long cells of (50–) 60–90(–120) × (9–)12–18(– 21) µm in mid-dorsal area and (25–)30–60(–70) × (10–)12–20(–24) µm at base, sinuous walls, 4–6(–7) µm thick, linear distribution. Short cells: Silica cells (12–)15–20(–24) × 14–19(–22) µm, circular to ovoid, frequent, solitary or in pairs with cork, or in threes with hook and cork cells, density (8–)9–12(–14) silica cells/100 µm 2 in mid-dorsal area and 12–16(–18) silica cells/100 µm 2 at base; Cork cells (5–)8–14(–18) × 12–18(–20) µm, sub-quadrangular to fusiform, sporadic, always with a silica cell. Spines and hairs: Hooks circular to ovoid (frequent) base (17–)21–28(–31) × 7–12(– 14) µm high, irregularly distributed between long cells, frequently solitary, sporadic in pairs with silica cells, density <1 hooks/100 µm 2 in base and <3 hooks/ 100 µm 2 in mid-dorsal part; Prickles circular to ovoid base (20–)24–32(–35) × 19–26(–29) µm, and up to 25 µm long, irregularly distributed between long cells, solitary, density <1 prickle/100 µm 2; Macro-hairs 500–800(–900) µm long, circular to obovate base (19–)20–25(–26) × 18–20(–22) µm, irregularly distributed across entire surface, denser at base.

Lemma apical surface: Characterised by long cells similar to those of the mid-dorsal area. Short cells: Silica cells equal in size and morphology, distributed solitarily, in pairs or threes with cork cells, hooks or prickles, density (5–)7–10 silica cells/100 µm 2; Cork cells of equal size, morphology, distribution and density. Spines and hairs: Hooks of equal size, morphology and occasionally with silica cells, denser than in the dorsal area 3–5 hooks/ 100 µm 2; Prickles similar base morphology and size than in dorsal area, up to 45 µm long, distributed at the middle of the apex, density 3–6(–7) prickles/100 µm 2; Macro-hairs up to 900 µm long, circular to ovoid base 16–22(–25) × 14–20(–21) µm, distributed at middle of apex. Stomata not studied.

Material studied: Morocco: Haut Atlas Centra, entre Aoni et Ouirgan, 29-VI-1954, G . Malengon, RAB21200 .

Figures

FIGURE 53. Lemma Surface Macrochloa tenacissima (1) and Macrochloa antiatlantica (2). A. Lemma central dorsal surface view. B. Lemma margin apex surface view. C. Lemma apex. D. Lemma base surface view. lc. Long cell. sc. Silica cell. cc. Cork cell. h. Hook. p. Prickle. mh. Macro-hair. sh. Short hair. s. stomata. Bars indicate 100 µm.