Plagiochila integerrima Steph.

Gradstein, S. Robbert & Reeb, Catherine, 2022, The genus Plagiochila (Dumort.) Dumort. (Marchantiophyta) in Madagascar, Cryptogamie, Bryologie 20 (5), pp. 65-106 : 80-82

publication ID	https://doi.org/ 10.5252/cryptogamie-bryologie2022v43a5
persistent identifier	https://treatment.plazi.org/id/AE6387E6-FFB2-FFE9-F7E8-3AB282F6FCED
treatment provided by	Felipe
scientific name	Plagiochila integerrima Steph.
status

Treatment

Plagiochila integerrima Steph. View in CoL

( Fig. 9)

Plagiochila integerrima Steph., Botanische Jahrbücher View in CoL für Systematik, Pflanzengeschichte und Pflanzengeographie 8: 83 (1886). — Type: São Tomé. Moller 40 (holo-, G00045484; fide Grolle 1995).

Plagiochila dichotoma (P.Beauv.) Nees & Mont. var. laxa Gottsche et al. , Synopsis Hepaticarum: 35 (1844). — Type: Madagascar ( Grolle 1995).

Plagiochila radicans Steph. , Bulletin de l’Herbier Boissier (sér. 2) 2 (12): 971 (1902). — Type: Madagascar ( Grolle 1995).

SPECIMENS EXAMINED. — Madagascar. Prov. Fianarantsoa • Andringitra Nat. Park, tributary W of Korokoro river , on streambed rocks, 750-1000 m, IX.1994, Szabó 9472/ S ( EGR).— Prov. Toamasina • W coast of Masoala Peninsula, S of Ambanizana village , on bark, 0-30 m, IX.1994, Kis 9446/HG ( EGR) .

Furthermore recorded from Joffreville, Prov. Antsiranana (Onraedt 70M5426) and La Mandraka, Prov. Antananarivo (Tixier 11205) by Vanden Berghen (1981).

DISTRIBUTION AND HABITAT. — Widespread in tropical Africa. In Madagascar found on bark and rock in humid to subhumid lowland and mid-elevation forests, from sea level to 1000 m.

DESCRIPTION (see also Jones 1962; Vanden Berghen 1981; Müller et al. 1999; Fischer 2013)

Plants 3.5-5 mm wide, to 5 cm long, very flat, sparsely branched, branches intercalary. Creeping, rhizome-like primary stem present. Mature stem leaves distant to subimbricate, ± widely and horizontally spreading, not ventrad, subsymmetrically oblong-obovate, c. 1.2-1.8× longer than wide, not ampliate, unbordered, apex very broad (about as broad as the leaf base), leaf not narrowed to the apex, rounded to truncate to emarginate, dorsal margin entire, with 5-20 short, triangular teeth in the upper half (like in P. alternans ), most teeth at the apex, the teeth 1-4 cells long; dorsal and ventral bases scarcely decurrent, ventral base shortly recurved. Leaf cells subisodiametrical, 20-28 µm wide in midleaf, very thin-walled, trigones absent or minute, vitta-like area absent; cuticle smooth; oil bodies not seen. Underleaves present, very small. Gametoecia not observed. Vegetative reproduction not observed.

NOTES

Plagiochila integerrima (sect. Cucullatae Schiffn.) is recognized by the obovate-oblong, non-ampliate, somewhat distant leaves with a very broad, rounded to truncate apex and small teeth in the upper half, scarcely decurrent leaf bases and very thin-walled leaf cells, without or with minute trigones.