ORIGINAL ARTICLE
Naming and describing the diversity in the Usnea cornuta
aggregate (lichenized Ascomycota, Parmeliaceae) focusing
on Brazilian specimens
1
Conservatoire et jardin botaniques de la Ville de Genève, 1 ch. de
l’Impératrice, 1292 Chambésy/GE, Switzerland
2
Universidade Federal do Rio Grande do Sul, Instituto de Biociências,
Departamento de Botânica, Laboratório de Micologia, Av. Bento
Gonçalves, 9500 Campus do Vale, CEP: 91501-970, Porto Alegre/RS,
Brazil
3
Instituto de Investigaciones en Ingeniería, Universidad de Costa Rica,
San Pedro de Montes de Oca, 11501, Costa Rica
Online publication date: 2020-12-29
Publication date: 2020-12-29
Plant and Fungal Systematics 2020; 65(2): 272-302
KEYWORDS
Central AmericaEuropemultispecies coalescent (MSC) modelsecondarymetabolitesSouth Americaspecies delimitation analysessystematics
ABSTRACT
This study is a reassessment of the Usnea cornuta aggregate diversity mainly in
Brazil. Based on previous multi-locus species delimitation analyses using the multispecies
coalescent model (MSC), we carried out a posteriori morphological and anatomical studies.
The following corticolous new species are described: Usnea arianae with norstictic or fatty
or lobaric acids, convex and efflorescent soralia and a lax medulla; U. flabelliformis with
protocetraric acid, fan-shaped main branches and a high medulla/cortex ratio; U. rubropallens
with protocetraric acid and a faint orange cortical/subcortical pigment; U. stipitata
with constictic acid, stipitate soralia and a high medulla/cortex ratio; and U. tenuicorticata
with protocetraric acid, a thin cortex and a high medulla/cortex ratio. The newly described
species were found to occur so far only in the Americas, except U. arianae which shows
an amphi-atlantic distribution in Europe and on the American continent. Seven species
already described belonging to the U. cornuta aggr. in Brazil are further treated here:
Usnea boomiana with caperatic acid and large, concave soralia, new to South America;
U. brasiliensis with protocetraric acid, minute and irregular soralia; U. cornuta with mainly
salazinic acid and minute soralia fusing into consoralia; U. macaronesica (syn. nov.: U. subglabrata)
with barbatic acid, large excavate soralia and a lax medulla; Usnea subpectinata,
a so far european species resurrected from the U. cornuta synonymy, with stictic acid and
numerous isidiofibrils, new to South America; and U. trachyclada with thamnolic acid
and K+ bright yellow stipitate soralia. Full descriptions with morphological, anatomical
and chemical features, geographical distributions, and illustrations are provided for each
species along with an identification key.
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Shi-Liang Liu, Xue-Wei Wang, Guo-Jie Li, Chun-Ying Deng, Walter Rossi, Marco Leonardi, Kare Liimatainen, Tapio Kekki, Tuula Niskanen, Matthew E. Smith, Joe Ammirati, Dimitar Bojantchev, Mohamed A. Abdel-Wahab, Ming Zhang, Enjing Tian, Yong-Zhong Lu, Jing-Yi Zhang, Jian Ma, Arun Kumar Dutta, Krishnendu Acharya, Tian-Ye Du, Jize Xu, Ji Seon Kim, Young Woon Lim, Alice Gerlach, Nian-Kai Zeng, Yun-Xiao Han, Parisa Razaghi, Mubashar Raza, Lei Cai, Mark S. Calabon, E. B. Gareth Jones, Rituparna Saha, T. K. Arun Kumar, K. Krishnapriya, Anjitha Thomas, Malarvizhi Kaliyaperumal, Kezhocuyi Kezo, Sugantha Gunaseelan, Sanjay Kumar Singh, Paras Nath Singh, Ajay Chandrakant Lagashetti, Kadambari Subhash Pawar, Shuhua Jiang, Chao Zhang, Huang Zhang, Yun Qing, Tolgor Bau, Xing-Can Peng, Ting-Chi Wen, Natalia A. Ramirez, Nicolás Niveiro, Mei-Xiang Li, Zhu L. Yang, Gang Wu, Entaj Tarafder, Danushka S. Tennakoon, Chang-Hsin Kuo, Tatiane M. da Silva, Cristina M. Souza-Motta, Jadson D. P. Bezerra, Gang He, Xiao-Hong Ji, Nakarin Suwannarach, Jaturong Kumla, Saisamorn Lumyong, Nopparat Wannathes, Shiwali Rana, Kevin D. Hyde, Li-Wei Zhou
Fungal Diversity
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Notes on the genus Usnea (lichenized Ascomycota, Parmeliaceae). V.
Philippe Clerc, Yoshihito Ohmura
Plant and Fungal Systematics
Philippe Clerc, Yoshihito Ohmura
Plant and Fungal Systematics
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