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Metaxya Lanosa, a Second Species in the Genus and Fern Family Metaxyaceae

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Metaxya Lanosa, a Second Species in the Genus and Fern Family Metaxyaceae Systematic Botany (2001), 26(3): pp. 480±486 q Copyright 2001 by the American Society of Plant Taxonomists Metaxya lanosa, a Second Species in the Genus and Fern Family Metaxyaceae ALAN R. SMITH University Herbarium, 1001 Valley Life Sciences Building #2465, University of California, Berkeley, California 94720-2465 HANNA TUOMISTO Department of Biology, University of Turku, FIN-20014 Turku, Finland KATHLEEN M. PRYER and JEFFERY S. HUNT Department of Botany, The Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, Illinois 60605-2496 PAUL G. WOLF Department of Biology, Utah State University, Logan, Utah 84322-5305 Communicating Editor: Jerrold I. Davis ABSTRACT. We describe and illustrate Metaxya lanosa, the second known species in the genus and the fern family Metaxyaceae (Pteridophyta). It is currently known from four different watersheds in Amazonian Peru and Venezuela. It can be distinguished readily from M. rostrata by the noticeably woolly-hairy stipes and rachises (hairs red-brown or orange-brown and easily abraded), broader, more elliptic pinnae, cartilag- inous and whitish pinna margins, more distinct veins abaxially, and longer pinna stalks, especially on the distal pinnae. rbcL data from a very limited sampling are ambiguous but do not reject support for the recognition of at least two species within Metaxya. The genus Metaxya (Metaxyaceae) heretofore has Peru, Bolivia, and northern Brazil. The new species been considered a monotypic genus in a monotypic is known from Amazonian Venezuela and Peru, family (Tryon 1970; Tryon and Tryon 1982; Kramer from four different watersheds, and is likely to be in Kubitzki 1990). Metaxyaceae is a member of the found in white-sand areas of Colombia and Brazil tree-fern assemblage of families (Smith 1995), as well. We name it for the densely woolly hairs of which together are a well-supported monophyletic the stipe and rachis, because this is one of the most group (Hasebe et al. 1995; Pryer et al. 1995). Al- striking characteristics of the species, even though though relationships among the major lineages of the hairs are easily abraded and may be lost tree ferns are still unclear (Wolf et al. 1999), Metaxya through careless or rough handling of specimens. is likely the sister group of a clade comprising Dick- sonia and Calochlaena (Dicksoniaceae), Lophosoria Metaxya lanosa A. R. Sm. & H. Tuomisto, sp. nov. (Lophosoriaceae), Cyathea (Cyatheaceae), and Hy- (Fig. 1).ÐTYPE: PERU. Loreto: Distr. Maynas, Ex- menophyllopsis (Hymenophyllopsidaceae), or at least perimental station ``El Dorado'' of INIA, Km 25 intimately related to these four families (Hasebe et along the road Iquitos-Nauta, low-statured forest al. 1995; Pryer et al. 1995; Stevenson and Loconte (varillal bajo hu medo) on white-sand soil, 100± 1996; Pryer et al. 1999; Wolf et al. 1999). 200 m, 38579050S, 738249310W, 24 Sep 1998, Tuo- The ®nding of a second species of Metaxya in misto & Ruokolainen 13054 (holotype USM!; iso- South America arouses considerable interest. The types AMAZ!, TUR!, UC!). Paratypes: Peru. Lor- well-known Metaxya rostrata (Kunth) C. Presl is eto: Distr. Iquitos, El Dorado-INIA, Varillal Alto widespread and common in lowland Amazonian Hu medo, 038 579 070 S, 738 249 360 W, VaÂsquez et forests and also outside this area, occurring from al. 23785 (MO, UC). Venezuela: Amazonas: Dpto. southern Mexico (Chiapas) to Panama, Guadeloupe, Atures, rõÂo Coro-Coro, W of Serrania de Yutaje, Trinidad, and Colombia to the Guianas, Ecuador, 8 km N of settlement of Yutaje, 058 419 450 N, 668 480 2001] SMITH ET AL.: NEW METAXYA 481 FIG.1. A.Metaxya lanosa. Adult leaf, basal pinna shown with sori. B. Metaxya rostrata. Distal part of rachis with the bases of some pinnae shown. Note the decurrent base especially in the distalmost lateral pinna. C. Metaxya lanosa. Pinna apex showing details of venation and the cartilaginous margin. D±E. Metaxya lanosa juveniles. In small juveniles (D), the pinnae are dissected; in larger juveniles (E) they become entire and remain that way. 482 SYSTEMATIC BOTANY [Volume 26 089 W, 450 m, Holst & Liesner 3150 (MO, UC-2 ally; and longer-stalked pinnae, especially in the sheets); Dpto. RõÂo Negro, Cerro de la Neblina, rõÂo distal part of the leaf (Fig. 1). In M. rostrata, the Mawarinuma, a¯uente del rõÂo Baria, 08 509 N, 668 distal pinnae are partially adnate and decurrent 109 W, 110±130 m, Steyermark & Luteyn 129730 onto the rachis. Metaxya rostrata also has hairs on (MO, UC-2 sheets, VEN); vicinity of Cerro Ne- the rhizome and the basal part of the stipe, but the blina base camp on rõÂo Mawarinuma, 08 509 N, hairs are shorter (usually 1±3 mm), straight, and 668 109 W, 140 m, Croat 59331 (MO, UC); same not nearly as densely disposed and woolly as in M. locality, Liesner 15643 (MO, UC); same locality, lanosa. On the croziers of M. rostrata, the hairs are Liesner 17315 (F, MO, UC); same locality, Stein & longer (may exceed 5 mm) but are shed well before Gentry 1733 (MO, UC); same general locality, the frond is fully expanded, except at the very base Plowman & Thomas 13569 (F, UC); same general of the petiole. The hairs of M. rostrata tend to be locality, 08 499 500 N, 668 099 400 W, Beitel 85026 yellowish on the rhizome and brown on the petiole. (NY, UC); 3±5 km NE of Cerro de La Neblina Metaxya lanosa is relatively easy to spot among col- base camp on rõÂo Mawarinuma, 150±200 m, Lies- lections of M. rostrata in herbaria, using the afore- ner 16332 (MO, UC-2 sheets); Cerro Duida, south- mentioned characters. eastern facing slopes along CanÄo Negro, 305± In western Amazonia, Metaxya rostrata comes in 1095 m, Steyermark 57957 (F-2 sheets). at least two forms, one with a few (about 10) rela- tively wide (up to 6 cm) pinnae, and the other with See note added in proof (p. 486) for additional many (about 20) much narrower (less than 4 cm) paratypes. pinnae. Both forms of M. rostrata are common in Differt a M. rostrata (Kunth) C. Presl stipitibus the ®eld, but the differences between them are not rhachidibusque pilis rubiginosis vel aurantiacis per- clear-cut, and hence it is not known whether they sistentibus dense ferentibus, laminis coriaceis, cras- merely represent wide variability in the morphol- sis, pinnis utroque rhachidis latere 5±10, ellipticis, ogy of the species, or whether they are constant 18±31 3 4.0±6.5 cm, longistipitatis (stipitibus 10±20 enough to merit taxonomic recognition. Both forms mm proximaliter, 1±9 mm distaliter), marginibus of M. rostrata, however, share the same leaf texture, cartilagineis, venis abaxialiter albidis prominenti- have non-cartilaginous (or only slightly so) pinna bus. margins, and lack the ferruginous woolly hairs on Stems stout, prostrate, with densely disposed, the stipe, and are in these ways clearly distinct from long, reddish brown to orange-brown hairs, espe- M. lanosa. In addition, the pinnae in the narrower cially toward the apex. Fronds ca. 0.9±1.5(±2.5) m form of M. rostrata are typically much longer in re- long; stipes woolly with densely disposed, long (up lation to their width than the pinnae in M. lanosa. to about 15 mm) reddish brown to orange-brown In the wider form of M. rostrata, where the pinna curly hairs throughout, these easily abraded with shape is more similar to that of M. lanosa, the de- age or handling; similar hairs extending to some current bases of the distalmost pinnae tend to be degree along the rachises. Blades coriaceous, 1-pin- especially wide (more than 1 cm in some cases). nate; pinnae 5±10 on each side of rachis, plus a con- Metaxya lanosa was ®rst brought to our attention form terminal pinna, simple, elliptic, largest ones by the ornithologist Jose Alvarez in Iquitos, who 18±31 3 4.0±6.5 cm, stalks 10±20 mm in proximal had been struck by its strong smell of anise and pinnae, (1±)3±9 mm in distal pinnae; margins car- brought some juvenile leaves to HT to ask the iden- tilaginous, pronouncedly whitish, entire except at tity of the plant. Since M. rostrata normally has no the tip, abruptly reduced to an attenuate-serrate tip. such smell, and the leaves did not look like typical Veins free, readily visible on both sides of blades, M. rostrata juveniles, HT followed JA to the locality raised and whitish abaxially. Sori round, exindusi- and collected the specimen that in the present pa- ate, scattered relatively evenly on the blades be- per is designated the type of M. lanosa. Juveniles tween the costae and 2/3 the distance toward the (e.g., isotype at TUR) show the same differences margin. from typical M. rostrata as adult specimens do Morphology. Metaxya lanosa differs from M. ros- (more coriaceous blades, more elliptic, cartilagi- trata in having densely woolly-hairy stipes and ra- nous-margined pinnae, lanose stipes), and there is chises (the hairs ferrugineous, long and curly, easily no dif®culty in assigning juveniles to one or the abraded); lamina with a thicker, coriaceous texture; other species. Juveniles of M. rostrata were de- broader, more elliptic pinnae; cartilaginous and scribed and illustrated by Tuomisto and Groot whitish pinna margins; more distinct veins abaxi- (1995). 2001] SMITH ET AL.: NEW METAXYA 483 Ecology and Distribution. This new species is Suksd. 1 P. appalachianum Hau¯er & Windham and apparently con®ned to forests on white-sand soils, P.australe FeÂe 1 P. macaronesicum A. E. Bobrov, were or on sandstone boulders. It is terrestrial or occa- both shown to differ by only ®ve out of 1323 rbcL sionally on rocks and logs at 100±450 m.
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