Achnatherum bromoides

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 : 86-87

Achnatherum bromoides (L.) P. Beauv. ( Figure 49 (1).

Lemma dorsal surface: Characterised by quadrangular long cells of (4–)6–12(–14) × (9–)12–18(–21) µm, smooth walls up to 1 µm thick, and similar to short cells, linear distribution. Short cells: main Silica cells (8–)10–21(–24) × (9–)11–20(–22) µm, circular to ovoid, linear distribution, frequently solitary, occasionally with cork cells, high density 20–35(–38) silica cells/ 100 µm 2; Cork cells fusiform 2–5 × 10–16(–18) µm, forming pairs with silica cells, sporadic. Spines and hairs: Hooks not studied; Prickles circular to obovate base 14–24(–26) × (12–)14–22(–26) µm and up to 45 µm long, density <1 prickles/ 100 µm 2; Macro-hairs 110–280(–350) µm long, circular to obovate base (8–)10–20(–22) × 9–19(–21) µm, irregularly distributed.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area but longer, up to 70 µm long. Short cells: Silica cells of equal size, distribution, and morphology to dorsal area cells, but low density, up to 10–16(–18) silica cells/ 100 µm 2; Cork cells of equal size, distribution and morphology to dorsal area cells. Spines and hairs: Hooks with circular base 16–20(–22) × 5–7 µm high, rare, solitary, density <1 hook/ 100 µm 2, distributed at distal part of apex; Prickles of equal morphology but longer, up to 65 µm, and denser, 18–24(–28) prickles/ 100 µm 2, distributed across lemma apical surface; Macro-hairs with circular to ovoid base 22–28(–31) × 19–26(–29) µm and up to 140 µm long, located at middle and distal part of apex.

Material studied: Morocco: Ifrane, Zoauia, 1200 m.a.s.l., 30-V-2022, M. Chamboleyron, ECWP n.n.; Route entre Azrou et ain Lenh, 19-VIII-2007, M. Chambouleyron ( ECWP s.n. (HSSrf 192)) .

Figures

FIGURE 49. Lemma surface Achnatherum bromoides (1) and Achnatherum paradoxum (2). A. Lemma central dorsal surface view. B. Lemma margin dorsal surface view. C. Lemma apex surface. 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.