Macrochloa gabesensis subsp. gabesensis (Moraldo, Raffaelli & Ricceri) F.M. Vázquez

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 : 93-94

Macrochloa gabesensis subsp. gabesensis (Moraldo, Raffaelli & Ricceri) F.M. Vázquez ( Figure 52 (1)).

Lemma dorsal surface (including base): Characterised by rectangular long cells of (42–) 60–105(–130) × (10–)12– 19(–22) µm, sinuous walls 5–9 µm thick, linear distribution. Short cells: Silica cells 15–20(–25) × 14–20(–22) µm, circular to ovoid, frequent, solitary or in pairs or threes with cork, occasionally hook cells, situated between long cells, density (9)12–15(–17) silica cells/100 µm 2; Cork cells (5–)7–10(–12) × 14–19(–21) µm, sub-quadrangular, reniform to fusiform, sporadic, always with a silica cell. Spines and hairs: Hooks circular to frequently ovoid base (16–)19–24(– 28) × 7–12(–14) µm high, irregularly distributed between long cells, frequently solitary, sporadically paired with silica cell, density <2 hooks/ 100 µm 2; Prickles not studied; Macro-hairs 600–950(–1200) µm long, circular to obovate base 22–28(–31) × 18–21 (–25) 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 of equal size, morphology, distributed solitarily, in pairs, threes and occasionally a four-cell union with cork and hook cells and prickles, at a lower density (6–)7–9(–10) silica cells/100 µm 2 than in dorsal area; Cork cells not studied. Spines and hairs: Hooks equal size, morphology, solitary, denser than in dorsal area 5–7 hooks/ 100 µm 2; Prickles ovoid base (19–)24–31(–33) × 19–26(–28) µm, and up to 30 µm long, irregularly distributed between long cells, solitary, density <3 prickle/100 µm 2, distributed at the middle of apex; Macro-hairs up to 1100 µm long, circular to obovate base 18–26(–30) × 16–19(–21) µm, irregularly distributed, more frequent at middle of apex. Stomata paracytic, rare at middle of apex.

Material studied: Morocco: Bouarfa-Zelmon, 0533652/ 3569235, 1070 m.s.a.l., 29-III-2017, M. Chambouleyron ( ECWP s.n. (HSSrf 156)); Gueraf Safsafat, -377500/ 3394443, 920 m.s.a.l., 12-IV-2019, M. Chambouleyron ( ECWP s.n. (HSSrf 285(1/2))) .

Figures

FIGURE 52. Lemma surface Macrochloa gabesensis subsp. gabesensis. (1) and Macrochloa gabesensis subsp. kelibiae (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. s. stomata. Bars indicate 100 µm.