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Pterygoneurum Compactum Sp. Nov. (Musci: Pottiaceae) Froro Spain

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Pterygoneurum Compactum Sp. Nov. (Musci: Pottiaceae) Froro Spain The Bryologist 97(4). 1994. pp. 412-415 Copyright© 1994 bytheAmericanBryologicalandLiehenologicalSociety.lne. Pterygoneurum compactum Sp. nov. (Musci: Pottiaceae) froro Spain MARIAJ. CANO,JUANGUERRA,ANDROSAM. Ros Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, Campus de Espinardo, 30071 Murcia, Spain Abstract. Pterygoneurum compactum sp. nov. is described and illustrated from Spain (Iberian Peninsula), where it grows on saline and gypsiferous soils. The new species is similar in habit to P. crossidioides Frey et al. but differs as discussed. The genus Pterygoneurum Jur., which is distrib• (scilicet, nervi) filamentis chlorophylliferis ramosis, cellula uted in the regions of the five continents with arid terminali eorum subsphaerica et pluripapillosa, praeditis. and semiarid climate, presents taxonomic difficul• Plant small, in gregarious turfs; stem erect, to 2 ties, some of which we attempt to resolve here by mm high, often apparently dichotomously branched, a careful study of described taxa. This will allow for without central strand; leaves erect-patent when a more precise determination ofthe true identity of moist, more or less imbricate when dry, concave, certain species. Wijk et al. (1967-1969) list nine ovate to oblong-ovate, 0.6-0.8 mm long, 0.4-0.6 species but in our opinion this number is rather high mm wide, apex rounded to obtuse, margins entire, and reductions to synonymy seem possible. Ac• plane to narrowly recurved at midleaf, papillose• cording to Touw (1974) 73-75% ofpublished spe• crenulate with small papillae; costa 50-70 Jlm wide cific and infraspecific names have been reduced to at leafbase, excurrent in a strong hyaline hair-point, synonyms in moss revisions between 1901 and 1974. 0.3-0.6 mm long, sometimes with a short muero, Pterygoneurum subsessile (Brid.) Jur., with a near• bearing two well-developed lamellae on adaxial side ly worldwide distribution (cf. Duell 1984), is mor• of upper half, with branched photosynthetic fila• phologically similar to P. californicum Crum (cf. ments arising from both sides oflamellae; filaments Crum 1967), known only from the type locality. Pterygoneurum arcticum.Steere has been synony• mized with P. lamellatum (Lindb.) Jur. (cf. Corley et al. 1981). Pterygoneurum ovatum (Hedw.) Dix. is a polymorphic taxon which is only slightly dif• ferent from P. medium (Salm.) Broth. and P. sam• paianum (Mach.) Mach. Pterygoneurum maclean• um Warnst. of South Africa and P. kemsleyi Willis of Australia are two little-known taxa with involute leaves, the differences between which are not very clear (cf. Magill 1981; Willis 1954). Pterygoneurum smardeanum Vanek is a controversial cleistocar• pous species, perhaps ofhybrid origin, and is a syn• onym of P. koslovii Laz. (Abramova et al. 1973). The most recently described species, P. crossidioides Frey et al. (Frey et al. 1990) is related to P. com• pactum sp. nov., described below, but they show clear-cut differences allowing ready separation. PrERYGONEURUMCOMPACTUMCano, Guerra & Ros sp. nov. (FrG. 1,2-9, 10-15) TYPE:SPAIN. ALICANTE.Elche, El Hondo lagoon, near Canal de Riegos, UTM: XH9927, Ros & Cano, 24.III.1993 (holotype: MUB4649). l 1000 Km Caulidia cylindro centrali carentia, dichotome ramosa. Folia ovato-oblonga, margine saepe revoluta, nervo in pil• um hyalinum excurrenti atque lamellis adaxialibus illius FIGUREl. Distribution of Pterygoneurum compactum. 0007 -2745/94/412-415$0.55/0 CANO ET AL.: PTERYGONEURUM SP. NOV. 413 FIGURES 2-9. Pterygoneurum compactum. - 2. Leaves.-- 3. Marginal cells ofthe leafapex. - ~. ~~~ar cells. - 5. Basal areolation of leaf. - 6-8. Cross sections of leaves. - 9. Sporophyte. (2-8 from ~fC3 ~9. ~olorype), (9 fram BCB 30390). 1994] CANO ET AL.: PTERYGONEURUM SP. NOV. 415 TABLEl. Comparison of Pterygoneurumcompactum crossidioides the lamellae are of uniform height and P. crossidioides. thraughout the entire length of the nerve, whereas P. compactum P. crossidioides in P. compactum they occur only in the upper half of the leaf, are very low at their base, and increase Lamellae Narrow below and Wide at the base in size progressively up to the midpoint. The lamina not reaehing the and reaehing the leafbase leafbase cells are smooth in P. crossidioides but papillose in Filaments Apieal cell papil• Apical cell smooth P. compactum. The leafmargin is usually plane and lose and general• and generally smooth in P. crossidioides and frequently recurved Iy spherical conic and papillose in P. compactum (Table 1). Laminal cells Papillose above Smooth through• All these differences are more than sufficient to out leaf Leafmargin Slightly reeurved Usually plane, delimit this new taxon, which will very likely be at midleaf, pa• smooth found at more sites in the Mediterranean Basin and pillose other regions of the world with an arid or semiarid climate. The new species is currently known fram only ACK.NOWLEDGMENTS three localities. The type locality is on saline soils This research was realized with financial aid from DGI• protected by Suaeda vera J. F. Gmelin and Phrag• CYT ofSpain (Proyect PB90-030 I-C02-0 1).We thank Dr. mites australis (Cav.) Trin. ex Steudel. Due to the J. S. Camón for his help with the SEM. The eonstruetive high salinity of this place, the major part of the suggestions of Dr. M. E. Newton and Dr. A. J. E. Smith vegetation is composed of communities of halo• are gratefully acknowledged. phytic plants belonging mainly to the vegetation LITERA TURE CITED class Arthrocnemetea. The average annual precipi• tation is approximately 276 mm and the average ABRAMOVA,A. L., L. S. BLAGODATSKICH& L. A. CZERE• temperature 17.7°C, which corresponds to a semi• PANOVA. 1973. Conspectus generis Pterygoneurum arid ombroclimate (Rivas-Martínez 1983). Ptery• Jur. (Musei) in URSS. Novitates systematieae plan• tarum non vaseularium 10: 305-316. goneurum compactum in this area is associated with CATCHESIDE,D. G. 1980. Mosses of South Australia. Aloina aloides (K. F. Schultz) Kindb., Bryum bicolor South Australia. Dicks., Pterygoneurum ovatum, P. subsessile (Brid.) CORLEY,M. F. Y., A. C. CRUNDWELL,R. DULL, M. O. Jur., and Tortula vahliana (K. F. Schultz) Mont. In HILL& A. J. E. SMITH. 1981. Mosses of Europe and northeastern Spain it occurs on gypsiferaus soil as• the Azores; an annotated list of speeies, with synonyms from the reeentliterature. Journal ofBryology 11: 609• sociated with Tortula brevissima Schiffn., Crossi• 689. dium crassinerve (De Not.) Jur., Phascum curvicolle CRUM, H. 1967. A new speeies of Pterigoneurum from Hedw., and Pterygoneurum ovatum. California. Madroño 19: 92-94. Pterygoneurum compactum is clearly related to DUELL,R. 1984. Distribution ofthe European and Ma• P. crossidioides, a species only known fram two sites earonesian mosses. 1. Bryologisehe Beitrage 4: 1-113. FREY,W., 1. HERRNSTADT& H. KURSCHNER.1990. Pter• near the Dead Sea, both possessing photosynthetic ygoneurum crossidioides(Pottiaeeae, Musci), a new branched filaments on the two supracostallamellae. speeies to the desert flora ofthe Dead Sea area. Nova This character has been found in P. ovatum (cf Hedwigia 50: 239-244. Abramova et al. 1973) and P. kemsleyi (Catcheside MAGlLL, R. E. 1981. Flora of Southern Afriea. Bry• ophyta, Part 1, Mosses. Pretoria. 1980), but in neither of these does the degree of RIVAS-MARTINEZ,S. 1983. Pisos biociimátieos de Es• proliferation and branching result in the formation paña. Lazaroa 5: 33-43. of a dense cushion as occurs in the first two taxa. Touw, A. 1974. Notes on taxonomie and floristie re• The main differences between P. crossidioides and seareh on exotie mosses. Journal of the Hartori Ha• p. compactum are as follows. The apical cells ofthe tanieal Laboratory 38: 123-128. WIJK,R. VANDER,W. D.MARGADANT&P.A. FLORSCh-L-rz.. filaments of P. compactum are clearly subspherical 1967-1969. Index Museorum. Utreeht. and papillose, whilst they are conical or very slightly WILLIS,J. H. 1954. Mosses new to western .-\ subspherical and smooth in P. crossidioides. In P. Yietorian Naturalist 71: 8-12..
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