Asplenium trichomanes subsp. quadrivalens D.E. Meyer (1962: 456) emend. Lovis (1964: 152)

Fischer, Eberhard & Lobin, Wolfram, 2023, Synoptic Revision of Aspleniaceae (Asplenium, Hymenasplenium) of Rwanda, Phytotaxa 608 (1), pp. 1-65 : 46

* Asplenium trichomanes subsp. quadrivalens D.E. Meyer (1962: 456) emend. Lovis (1964: 152) .

Lectotype (designated here): — GERMANY. Kienberg bei Ruhpolding in Bayern, 24 Juli 1957, cultivated under number 82, D.E.Meyer 2773 ( B 20 0024245a!, specimen in the upper left capsule); syntypes same locality, 23 Juli 1957, D.E.Meyer s.n. cultivated under number 47 (same barcode B 20 0024245a!), same locality, 22 Juli 1957, D.E.Meyer s.n. (same barcode B 20 0024245a!), cultivated under number 43; same locality, 22 Juli 1957, D.E.Meyer s.n. (same barcode B 200024245!), cultivated under number 42.

Protologue citation: —“Kienberg bei Ruhpolding in Bayern, leg. D.E.Meyer, 22. – 24.7.1957. In Herb. Mus. Bot. Berol.—Lebend in Kultur als Sporophyten No. 42, 43, 47, 82“

New record for Rwanda:— Northern Province: Volcano NP, Muhabura, Volcanic rocks in open areas, 2893 m, S1°22`02.11`` E29°41`36.03``, 20 August 2007, E.Fischer s.n. ( KOBL) .

Habitat: —Basophilic volcanic rocks in open areas, elev. 2893 m.

Distribution in Rwanda:—Northern Province: Volcano NP: Muhabura.

Distribution in Africa: — Morocco, Algeria, Tunisia, Ethiopia, Somalia, Kenya, Tanzania, Zimbabwe, South Africa, Lesotho. Also distributed worldwide.

Note: —The type has for a long time been regarded as lost ( Roux 2009). We could retrieve authentic herbarium specimens of cultivated plants that are mentioned in the protologue. As Meyer (1962: 456) lists as collecting dates 22–24 July, we had the choice between four collections from which we selected the above cited specimen No. 82 as lectotype.

The species has already been recorded on the Ugandan side of Muhabura in Mgahinga NP (December 1957, Allen 3733, K, not seen) ( Beentje 2008: 32).