A Remarkable New Species of Geastrum with an Elongated Branched Stipe
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mycoscience 58 (2017) 344e350 Available online at www.sciencedirect.com journal homepage: www.elsevier.com/locate/myc Short communication A remarkable new species of Geastrum with an elongated branched stipe Tiara S. Cabral a, Julieth O. Sousa b, Bianca D.B. Silva c, Marı´a P. Martı´n d,*, Charles R. Clement e, Iuri G. Baseia f a Programa de Pos-Graduac ¸ao~ em Genetica, Conservac¸ao~ e Biologia Evolutiva, Instituto de Pesquisa da Amazonia,^ Manaus 69067-375, Brazil b Programa de Pos-Graduac ¸ao~ em Sistematica e Evoluc¸ao,~ Universidade Federal do Rio Grande do Norte, Campus Universitario, Natal 59072-970, Brazil c Departamento de Botanica,^ Universidade Federal da Bahia, Instituto de Biologia, Ondina, Salvador 40170115, Brazil d Departamento de Micologı´a, Real Jardı´n Botanico eCSIC, Plaza de Murillo 2, 28014 Madrid, Spain e Coordenac¸ao~ de Tecnologia e Inovac¸ao,~ Instituto Nacional de Pesquisas da Amazonia,^ Manaus 69067-375, Brazil f Departamento de Botanica^ e Zoologia, Universidade Federal do Rio Grande do Norte, Campus Universitario, Natal 59072-970, Brazil article info abstract Article history: Based on morphological and molecular analysis, we describe the new species Geastrum Received 24 August 2016 verrucoramulosum, discriminated from other species in the section Exareolata mainly by an Received in revised form elongated, verrucose, branched stipe. This new species is currently known from two forest 22 March 2017 locations in central and southwestern Amazonia. Species description, images, and taxo- Accepted 26 March 2017 nomic discussion of both morphological and molecular data are provided. Available online 19 May 2017 © 2017 The Mycological Society of Japan. Published by Elsevier B.V. All rights reserved. Keywords: Geastraceae Neotropics Phallomycetidae Phylogeny Taxonomy The order Geastrales K. Hosaka & Castellano (Hosaka et al. sequences of tropical species are needed, and may modify the 2006) has been the subject of studies to elucidate the phylo- current phylogeny. genetic relationships among its genera and species (Hosaka In recent years, intensive fieldwork focusing on gasteroid and Castellano 2008; Kasuya et al. 2012; Zamora et al. 2013, fungi (Basidiomycota) has been carried out in several Brazilian 2014). However, the diversity of tropical earthstars is still biomes, including the Semi-arid, Atlantic Rainforest, and poorly known. New discoveries and the inclusion of DNA Amazon Rainforest, especially focusing on Geastrum species * Corresponding author. Fax: þ34 914200157. E-mail address: [email protected] (M.P. Martı´n). http://dx.doi.org/10.1016/j.myc.2017.03.004 1340-3540/© 2017 The Mycological Society of Japan. Published by Elsevier B.V. All rights reserved. mycoscience 58 (2017) 344e350 345 (Sousa et al. 2014a, b; Cabral et al. 2014b). These studies have of aligned sequences from each DNA region were concate- revealed exceptional new and unusual diversity, totaling 54 nated to form one single matrix. This matrix was used to species described so far for Brazil (Baseia and Milanez 2002; perform maximum parsimony and Bayesian phylogenetic Baseia and Calonge 2006; Fazolino et al. 2008; da Silva et al. analyses. The maximum parsimony analysis was conducted 2013; Cabral et al. 2014a; Sousa et al. 2015). In this study, our with PAUP* 4.0 (Swofford 2003). The trees were calculated with goal is to provide new information about the genus Geastrum a heuristic search, with branch swapping, using the TBR al- in the Amazon Rainforest by describing a remarkable new gorithm, with initial trees obtained by stepwise addition of species with an elongated and branched stipe. random additional sequences repeated 100 times, and boot- Specimens were collected during the rainy season of 2012 straps of 1000 replicates. The Bayesian analysis was per- in the Brazilian Amazon rainforest. One specimen (LABEV formed with MrBayes v.3.1.2. (Huelsenbeck and Ronquist 6059) was collected during an ecology field course conducted 2001), where trees were calculated using two different runs by the Federal University of Acre (UFAC) and the Research with four incrementally heated simultaneous MCMC simula- Program on Biodiversity (PPBio), and sent to the first author by tions over 10 million generations for the first analysis and 2 the collectors. Descriptive terminology and taxonomy are million for the second analysis, with trees sampled at every based on Sunhede (1989), Baseia and Milanez (2002), and da 1000 generations. To estimate posterior probabilities and Silva et al. (2013). Color codes follow Kornerup and calculate the consensus tree, part of the trees was discarded Wanscher (1978). For light microscopy, free-hand sections as a burn-in stage observing the average standard deviation of were mounted in 5% (w/v) KOH and then examined with a split frequency values. The trees were edited with FigTree Nikon Eclipse Ni light microscope (Nikon Corporation, Tokyo) (http://tree.bio.ed.ac.uk/software/figtree/). All molecular data coupled with a Nikon DS-Ri camera (Nikon Corporation, can be accessed at TreeBase under ID 19668. Tokyo), supported by NIS-Elements AR 4.00.03 software Alignment 1 consisted of 133 taxa and 1512 characters (Nikon Corporation, Tokyo). Thirty randomly selected basid- (862 nuc-LSU and 649 atp6), among which 508 were iospores were measured using light microscopy, under the parsimony-informative characters. The maximum parsi- 100Â immersion oil objective, with 10Â oculars. All measure- mony and Bayesian analyses resulted in similar phyloge- ments include basidiospore ornamentation. Basidiospore ab- netic trees, where the new species clustered with species breviations follow Sousa et al. (2014a):n¼ number of from section Exareolata De Toni (trees not shown; see Tree- randomly measured basidiospores; x ¼ mean ± standard de- Base ID 19668). In alignment 2, only species from section viation of basidiospore diameter and height (including orna- Exareolata were included, with G. schmidelii as outgroup. The ¼ mentation); Qm mean height/width quotient. Scanning concatenated matrix consisted of 16 taxa and 1496 charac- electron microscopy studies were performed at the Uni- ters (906 corresponding to nuc-LSU and 589 corresponding to versidade Federal do Rio Grande do Norte (UFRN) with a Phi- atp6), among which 236 were parsimony-informative char- lips XL 20 (Philips Company, Amsterdam), in accordance with acters. We obtained one most parsimonious tree with 543 previously described methods (da Silva et al. 2011). Specimens steps and CI ¼ 0.705, RI ¼ 0.788, RC ¼ 0.555. Both maximum are deposited in the fungal collection of the INPA and UFRN parsimony and Bayesian analyses resulted in similar trees Herbaria (Manaus and Natal, Brazil). (Fig. 1), where the new species is a sister clade of Geastrum DNA extraction was performed from a small piece of the cf. stipitatum [determined in Zamora et al. (2014)], also from dried basidioma, following da Silva et al. (2013). Two DNA Brazilian Amazon Rainforest. Due to the unique LSU and regions were amplified, the nuclear large subunit rDNA (nuc- atp6 sequences, as well as unique morphological characters, LSU) and the mitochondrial ATPase subunit 6 coding region the new species Geastrum verrucoramulosum is here (atp6), using primers developed by Vilgalys and Hester (1990) described. and Kretzer and Bruns (1999). The PCR fragments were puri- fied with ExoSAP-IT (Affymetrix Inc., Thermo Fisher Scientific, Taxonomy Waltham), and sequenced with BigDye™ Terminator Cycle Sequencing Ready Reaction Kit version 3.1 (Applied Bio- Geastrum verrucoramulosum T.S. Cabral, J.O. Sousa, & Baseia, systems™, Thermo Fisher Scientific, Waltham). The nuc-LSU sp. nov. Figs. 2e4. and atp6 sequences generated in this study, and those pub- MycoBank no.: MB817844. lished by Zamora et al. (2014) and Cabral et al. (2014b), were aligned and manually edited in Geneious R6.1 (Biomatters Diagnosis: Unexpanded basidioma epigeous, caespitose, Ltd., New Zealand), treating each DNA region separately. Two surface densely verrucose, developed above a prominent and datasets were analyzed. The first was used to determine in ramulose stipe (17e41 mm high). Endoperidium comprised of which section the new species belongs; preliminary analyses irregularly arranged hyphae. Peristome not truly plicate, were done including sequences of representatives from all becoming fibrillose with age, not delimited. Columella circu- sections (alignment 1), according to Zamora et al. (2014), and lar. Basidiospores globose, 3.6e4.5 Â 3.6e4.4 mm, verrucose, using Myriostoma coliforme (Dicks.) Corda as outgroup. In order short warts, columnar, with flattened to rounded apex. to delimitate the new species, the second dataset was Type: BRAZIL, Amazonas, Manaus, Estac¸ao~ Experimental analyzed using only representatives of the section in which de Manejo Florestal ZF-2, on clay soil, 17 Mar 2012, leg. D.L. the new sequences belong, and using G. schmidelii Vittad. as Komura 286 (holotype, INPA 264956), Genbank KX670829 outgroup (alignment 2) (Table 1). (atp6), KX670831 (nuc-LSU). The GTR substitution model was chosen by MrModelTest Etymology: verrucoramulosum (Lat.), referring to the ramu- 2.3 (Nylander 2004) for both atp6 and nuc-LSU. The two blocks lose stipe and the verrucose surface of the exoperidium. 346 mycoscience 58 (2017) 344e350 Table 1 e Sequences used in alignment 2. Species names, herbarium vouchers, localities, and Genbank accession numbers. Species Herbarium voucher Locality nuc-LSU atp6 Geastrum albonigrum UFRN-Fungos 1989 Brazil KJ127019 KJ127015 Geastrum