Stipa letourneuxii var. tunetana (H. Scholz) 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 : 112

Stipa letourneuxii var. tunetana (H. Scholz) F.M.Vázquez ( Figure 63 (3)).

Lemma dorsal surface: Characterised by sub-quadrangular to rectangular (fewer) long cells of (16–)18–24(–28) × 16–22 µm, smooth walls up to 11 µm thick, linear distribution. Short cells: main Silica cells 9–14 × 17–21 µm, circular to oblong, sporadic, frequently in pairs or threes with hook cells, situated between long cells, occasionally solitary; Cork cells 4–8(–9) × 17–20 µm oblong to fusiform, sporadic, in all cases with a silica cell and occasionally a hook cell. Spines and hairs: Hooks circular to oblong base 16–24 × 6–9(–10) µm high, regularly distributed between long cells, in pairs or threes with silica, or additional hook cells, more frequent solitary, density 8–10 hooks/100 µm 2; Prickles not studied; Macro-hairs up to 380 µm long, circular base (9–)11–16 µm, regularly distributed in lines from base to mid-dorsal surface.

Lemma apical surface: Characterised by long cells similar to those of the dorsal area, thinner and more numerous, size (9–)11–37 × 7–10 µm. Short cells: Silica cells of equal size and morphology to the dorsal, more frequent; Cork cells equal in size, distribution and morphology to the dorsal. Spines and hairs: Hooks equal in size and morphology to the dorsal, irregular in distribution and of higher density (18–26 hooks/100 µm 2); Prickles circular to ovate base, 20–24 × 19–28 µm, 35–88 µm long, distributed at middle and distal parts of apex; Macro-hairs ovate to circular base 22–28 × 24–33(–35) µm, and up to 360 µm long, distributed at upper apex.

Material studied: Tunisia: Chahbania, near to Neffatia, 10°53′E, 33°15′N, IV-1996, M . Visser, HSS 11860 ; Close Taguelmit , 11°13′E, 32°59′N, IV-1996, M . Visser, HSS 7428 .

Figures

FIGURE 63. Lemma surface Stipa letourneuxii subsp. letourneuxii (1) Stipa letourneuxii. var. ignea. (2) and Stipa letourneuxii. var. tunetana (3). A. Lemma central dorsal surface view. B. Lemma margin dorsal surface view. C. Lemma apical surface. lc. Long cell. sc. Silica cell. cc. Cork cell. h. Hook. p. Prickle. mh. Macro-hair. Bars indicate 100 µm.