Taxonomic and phylogenetic studies of helvella (Pezizales) from Eastern Asia

Name: Zhao, Qi

Organization : Mae Fah Luang University

keyword: Taxonomic and phylogenetic

LCSH: Helvella

Classification :.LCCS: QH367.5

LCSH: Biology -- Classification

LCSH: Biogeography

LCSH: Evolution (Biology)

Abstract: The fungal family Helvellaceae are a monophyletic assemblage of genera and species from all over the world, including auriculoid, cupulate, saddle-shaped to irregular-lobed epigeous apothecia, as well as hypogeous taxa with closed, folded to solid ascomata. Helvella, the type genus of Helvellaceae, is a monophyletic assemblage of sections and species from north temperate regions, but large parts of its taxonomy and evolutionary, for a very long time, are limited mainly in Europe and North America, little is known in Asia, Africa, Australia and South America. In this thesis, collections of Eastern Asia Helvellaceae, with an emphasis on the Helvella and Wynnella, were investigated using morphology and DNA sequence data. Phylogenetic analyses inferred from ITS, 28S and TEF1-α sequence data strongly support lineages corresponding to morphological features. The infrageneric system and phylogeny within the genus are also discussed. The main results are summarized as follows. Chapter 1 introduces taxonomy and systematics of Helvella. Based on the collections of Helvella from China, Germany, Italy, Japan, Russia and Thailand, full descriptions of Helvella and its respective species are presented. In Eastern Asia, sixty-seven species of Helvella are identified, of which 46 are new to science, viz. H. crispoides, H. involuta, H. maculatoides, H. orienticrispa, H. pseudoreflexa and H. subcrispa within the section Cripae; H. adhaesa, H. atramenta, H. bachu, H. bambusicola, H. elastoides, H. exigua, H. liquii, H. longiasca, H. orientielastica, H. pantharina, H. pseudoatra, H. polymorpha, H. multicolor, H. sinoalbella, H. sinoelastica, H. subalba, H. subalbella, H. subelastica, H. sublatispora and H. subspadiea within the section Elasticea; H. cystidiata, H. pseudolacunosa, H. monilifera, H. sublacunosa, H. trilobata, H. sublactea, H. rugosa, H. siama, H. vallata within the section Lacunosae; H. atricolor, H. guttata, H. mutabilis, H. orientimacropus, H. spina, H. subephippium, H. subfibrosa, H. submacropus and H. tomentosoides within the section Macropodes, H. floriforma and H. tinta in section Tinae. The remaining recognized species no formal descriptions are offered because only limited collections are available or absent detail fresh morphology description. Furthermore, the European H. abella, H. capucina, H. elastica, H. jilinensis, H. latispora, H. macropus, H. spadiea, H. stevensii and H. subglabra are described, and the fruit-bodies photos, and microstructure traits of these species are also taken. A key to the sections of the genus and keys to the species studied in each section are provided. Chapter 2 reconstructs molecular phylogeny of Helvella. In this thesis, 359 sequences of 28S, 330 sequences of ITS and 288 of TEF1-α were newly obtained, respectively. Phylogenetic relationships within Helvella using ITS, 28S and TEF1-α, respectively or combined, are inferred. All the analyses strongly support the monophyly of the Helvella within the Helvellaceae, although the terminal clades are different. However, all these terminal clades meet their corresponding morphological features, except few clades in 28S and TEF1-α data sets. Ninety species (about twice of the accepted species) are recognized, including 67 new species, and 23 known species. Evident endemism is detected in Helvella and East Asia is identified as the center of species diversity of Helvella. Based on a phylogenetic consensus using combined multi-gene sequence analyses, divergence time and considering morphology, this study propose a revised taxonomic system for Helvella, namely, section Acetabulum, section Crispae, section Elasticae, section Lacunosae, section Leucomelanea, section Macropodes and section Tintae. Furthermore, molecular phylogeny indicates that Helvella may be diverged from Wynnella at late Palaezoic. Chapter 3 reports another new taxon. The genus Wynnella has long been regarded as a monotypic genus, consisting only Wynnella auricula (Schaeff) Boud. Morphological and phylogenetic studies are carried out on new collections of Wynnella from Sichuan, Tibet and Xinjiang, in southwestern China. Morphology and phylogenies, inferred from the internal transcribed spacer region of ribosomal DNA (ITS) and the D1-D3 region of 28S nrDNA (28S) sequences data, clearly indicate these collections representing some new species in the genus.

Mae Fah Luang University. The Learning Resources and Education Media Center

Address: Chiang Rai

Email: library@mfu.ac.th

Name: Siraprapa Brooks

Role: Advisor

Name: Kevin D. Hyde

Role: Co-Advisor

Created: 2016

Issued: 2560

Modified: 2020-04-29

Issued: 2017-08-17

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Thesis QH367.5 Z634t 2016

eng

DegreeName: Dotor of Philosophy

Level: Doctoral Degree

Descipline: Biosciences

Grantor: Mae Fah Luang University

©copyrights Mae Fah Luang University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	Qi Zhao.pdf	15.56 MB	20	2026-05-26 18:16:01

ใช้เวลา

0.03153 วินาที