Acrostichum punctatum L. f.

Callmander, Martin W., Mazumdar, Jaideep & Jarvis, Charles E., 2019, Typification and nomenclature of the western Indian Ocean islands ferns and lycophytes described in Linnaeus filius’s Supplementum plantarum, Candollea 74 (2), pp. 223-234 : 226-229

Acrostichum punctatum L. f. , Suppl. Pl.: 444. 1782 [nom. illeg.] [non L., 1763].

≡ Bolbitis auriculata (Lam.) Alston in J. Bot. 72, Suppl.: 3. 1934. ≡ Acrostichum auriculatum Lam., Encycl. 1: 36. 1783 [ nom. nov.]. ( Dryopteridaceae )

Lectotypus (designated here): RÉUNION: “nº 28. Acrostichum de l’île de Bourbon ”, s.d., Commerson s.n. ( LINN-HS nº 1622.27 image seen ; isolecto-: MPU [ MPU1054971 , MPU1054973 ]!, P [ P01427005 ]!) ( Fig. 2 , 4 ).

Notes. – A single specimen of original material is extant in LINN-HS [LINN-HS nº 1622.27]. This specimen bears a label in Thouin’s hand to which Linnaeus f. has added the words “punctatum ny” ( Fig. 2 , 4 ). This specimen bears the number “28”. Two collections representing duplicates of the original material have been located in MPU [MPU1054971, MPU1054973] and are considered as isolectotypes. A third duplicate of this original material has been located in P [P01427005]. This specimen is the only known duplicate originating from the herbarium of Dr. Baron J.-A. Barbier (1767– 1846), bequeathed to the MNHN and incorporated within the collection in 1847. The identity of the lectotype material corresponds with the current usage of the name.

The specimens cited as type by MICKEL (2002), LORENCE & ROUHAN (2008) and ROUX (2009) at C [C10001539], S [S-P-2197] and P [P01426989, P01427003] are Commerson collections without any Thouin annotation and are not considered here as original material. Another Commerson collection is extent in G [G00341870]. Unusually for Commerson collections, G00341870, P01426989 and P01427003 bear a precise collection locality and date: “des bords de la rivière des Calebasses en février 1773 ”.

Bolbitis auriculata is distributed in Tropical Africa, the Comoro islands, Mauritius, Réunion and Madagascar ( LORENCE & ROUHAN, 2008).

Figures

Fig. 2. – Labels of original material of Acrostichum punctatum L. f. A. Lectotype in LINN-HS bearing in Thouin’s hand the number “28” to which Linnaeus f. has added the epithet “punctatum” and “ny” (=“new”); B. Isolectotype in MPU originating from Thouin’s herbarium with, in Thouin’s hand: “Con” for Commerson as collector and “Env. a m. Linn. S. le nº 28” [sent to Linnaeus under nº 28]. [A: LINN-HS nº 1622.27; © Linnean Society of London; B: MPU1054971; © Université de Montpellier – Herbier MPU (SPH)]

Fig. 4. – Lectotype of Acrostichum punctatum L. f. in LINN-HS.