Page 141 - 《广西植物》2020年第2期
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2 7 8                                  广  西  植  物                                         40 卷
   al.ꎬ 2016). It was rather recently established to accommo ̄  menia resulting in a ± distinctly layered marginꎬ with an
   date species with rounded ascomata and a layered margin  apically free proper exciple that is dark brown to car ̄
   formed by concentrically arranged remnants of carbonized  bonizedꎬ a strongly conglutinated hymeniumꎬ distinct
   excipular tissue from older hymenia. In recent yearsꎬ  lateral paraphysesꎬ ascospores transversely septate to
   some small genera of graphidaceae have been reported in  muriformꎬ hyaline to yellowish or brownish at late matu ̄
   Chinaꎬ such as thelotremoid genera Chapsa (Xu & Jiaꎬ  rity. The genus grows on bark and wood and is found
   2015) and Myriotrema (Xu et al.ꎬ 2016)ꎬ and graphioid  world ̄wideꎬ with a concentration of species in
   genera Carbacarthographis (Jia et al.ꎬ 2017ꎻ Liu et al.ꎬ  Australiaꎬ mainly  in  cool ̄temperate  and  warm ̄
   2018)ꎬ Fissurina ( Jia et al.ꎬ 2018) and Leiorreuma  temperate rainforestsꎬ less commonly in subtropical and
   (Wang et al.ꎬ 2015). Based on specimens collected from  tropical habitats. Schizotrema is most similar to Tope ̄
   Yunnan Provinceꎬ this genus is here newly reported from  liopsis Kantvilas & Vězdaꎬ but differs in the carbonized
   Chinaꎬ with a single speciesꎬ Schizotrema guadeloupense.  excipula. Several other genera of thelotremoid Graphi ̄
                                                     daceae form lateral paraphysesꎬ viz. Acanthotrema
   1  Materials and Methods                          Frischꎬ Chapsa A. Massal.ꎬ Melanotopelia Lumbsch &
                                                     Mangoldꎬ Pseudoramonia Kantvilas & Vězdaꎬ Schizotrema

       The specimens are deposited in Fungariuml of the  Mangold & Lumbschꎬ Thelotrema Ach.ꎬ and Topeliopsis
   College of Life Sciencesꎬ Liaocheng Universityꎬ China  Kantvilas & Vězda. except for Melanotopelia and
   ( LCUF ). OLYMPUS SZX16 and TECH XTS ̄30D          Schizotremaꎬ have a non ̄carbonized excipulumꎬ and Me ̄
   dissecting microscopesꎬ and OLYMPUS BX53 compound  lanotrema differs from Schizotrema in the simpleꎬ non ̄
   microscope were used for the morphological and    layered excipulum. Crutarndina Parnmenꎬ Lücking &
   anatomical studiesꎬ and the lichen substances were detec ̄  Lumbsch agrees with Schizotrema in the  layered
   ted using  standardized  thin  layer  chromatography  excipulum but only has the apical portion carbonized and
   (TLC). These were conducted as described in Jia & Wei  both genera are phylogenetically unrelated.
   (2016).                                               Schizotrema guadeloupense ( Hale ) Mangold &
                                                     Lumbschꎬ in Mangoldꎬ Elix & Lumbschꎬ Fl. Australia
   2  Descriptions                                   57: 657 (2009). —Thelotrema guadeloupense Haleꎬ
                                                     Phytologia 26: 416 (1973)ꎻ type: Guadeloupeꎬ Parc
       Schizotrema Mangold & Lumbschꎬ in Mangoldꎬ Elix  National de Guadeloupeꎬ M. E. Hale 31633ꎻholotype:
   & Lumbschꎬ Fl. Australia 57: 657 (2009).          US!
       Type species: Schizotrema zebrinum Mangold.                                            Fig. 1
       Thallus corticolousꎬ crustoseꎬ pale grey to yellowish ̄  Thallus partially endoperidermalꎬ pale greyish
   greenꎬ smooth to rough. Photobiont trentepohlioid.  green to pale oliveꎬ dull to glossyꎬ smooth to roughꎬ
   Apothecia erumpent to prominentꎬ± roundedꎬapothecioid  corticateꎻ cortex 15-20 μm thickꎻ photobiont layer con ̄
   but usually with a narrow poreꎬ regenerating with concen ̄  tinuous.
   trically layered excipula and laterally covered by thalline  Ascomata  rounded  to  somewhat  irregularꎬ
   layerꎬ concolorous with the thallusꎻ excipula more or less  erumpentꎬ 0.5-0.8 mm diam.ꎬ regenerating with layered
   carbonizedꎬ periphysoids usually presentꎻ new hymenia  margins. Disc usually hidden by excipular materialꎬ
   formed from below the previous hymeniaꎻ ascospores  pore 0.2-0.4 mm diam.ꎬ rounded to angularꎬ formed by
   transversely septate or muriformꎬ non ̄amyloid.    the apices of the innermost excipular tissue. Proper ex ̄
       Chemistry: β ̄orcinol depsidonesꎬ or no lichen  ciple usually apically freeꎬ dark brown to carbonized
   substances present.                               and usually containing periderm cells. Hymenium 150-
       Notes: Schizotrema is characterized by erumpent to  200 μm highꎻ periphysoids conspicuous. Epithecium
   prominentꎬ apothecioid ascomata with regenerating hy ̄  indistinct. Asci 8 ̄spored. Ascospores richly muriformꎬ
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