Thalloconidia in the genus Umbilicaria

Hestmark, Geir

doi:10.1111/j.1756-1051.1990.tb00546.x

Cited by 30 publications

(33 citation statements)

References 11 publications

(10 reference statements)

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“…They are most frequently found in the genus Umbilicaria Hoffm. (Hestmark 1990) but have also been reported in Protoparmelia M. Choisy, Rhizoplaca Zopf and Sporastatia A. Massal. (Poelt & Obermayer 1990).…”

Section: Mycobank No: Mb805057mentioning

confidence: 87%

A contribution to the familyLecideaceaes. lat. (Lecanoromycetidaeinc. sed., lichenized Ascomycota) in the southern subpolar region; including eight new species and some revised generic circumscriptions

Fryday¹,

Hertel²

2014

The Lichenologist

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Eight new species of Lecideaceae are described from the southern subpolar region: Bryobilimbia coppinsiana Fryday, a saxicolous species with one septate ascospores (Campbell Island, New Zealand); Immersaria fuliginosa Fryday, with a thallus composed of thalloconidia (Falkland Islands); Lecidea aurantia Fryday, with an orange thallus (Auckland Islands, New Zealand); L. campbellensis Fryday, with an endolithic thallus and apothecia resembling those of a species of Porpidia (Campbell Island); Poeltiaria ochyrae Hertel, which is similar to P. subincongua but with a thick areolate thallus (South Orkney and South Shetland Islands); P. tasmanica Fryday, which is similar to P. urbanskyana but with smaller ascopores (Tasmania); Poeltidea inspersa Fryday with an enolithic thallus and a hymenium with large oil globules (Falkland Islands); and Porpidia vulcanoides Hertel & Fryday with immersed apothecia with a thick margin and large ascospores (SW Chile). Lecidea kalbii Hertel is resurrected from the synonymy of L. mannii Tuck. and treated as a distinct species. The circumscription of genera within the Lecideaceae is also discussed: Poeltiaria is shown to be heterogeneous, and the genera Labyrintha and Notolecidea are reduced to synonymy with Poeltidea and Poeltiaria respectively, and the new combinations Poeltidia implexa (Malcolm et al.) Hertel & Fryday and Poeltiaria subcontinua (Hertel) Hertel & Fryday made. A key to the genera of Lecideaceae s. lat. is provided.

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Section: Mycobank No: Mb805057mentioning

confidence: 87%

A contribution to the familyLecideaceaes. lat. (Lecanoromycetidaeinc. sed., lichenized Ascomycota) in the southern subpolar region; including eight new species and some revised generic circumscriptions

Fryday¹,

Hertel²

2014

The Lichenologist

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“…Thallus sections were cut by a freezing microtome, 5, 10 or 15 μm thick, and mounted in lactophenol cotton blue. Thalloconidia (Hestmark , ) were examined in thin sections and photomicrographed using a scanning electron microscope (SEM). DNA from some of the Ecuador specimens have previously been sequenced in the context of a study of the endemic central Andean Umbilicaria element (Hestmark et al ), and the specimen number, type of sequences and GenBank accession numbers are provided.…”

Section: Methodsmentioning

confidence: 99%

The lichen genusUmbilicariain Ecuador

Hestmark

2016

Nordic Journal of Botany

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Nine species of the saxicolous lichen genus Umbilicaria from Ecuador are reported and a key is provided: U. africana, U. aprina, U. cinereorufescens, U. decussata, U. dendrophora, U. haplocarpa, U. leprosa, U. nylanderiana and U. vellea. The species diversity of this genus on the equatorial high mountains of South America is low compared to North America and Eurasia, but similar to that found on high African peaks close to the equator. The species mostly belong to a high‐alpine element with worldwide distribution. Two species belong to an Andean endemic element, viz U. haplocarpa and U. leprosa. The low diversity and low percentage of endemism may reflect the fairly recent uplift of the Andes and the comparatively small geographic extent of the alpine Andean biota. The dense rainforests of Ecuador leave few suitable open rock habitats for the establishment of these light‐craving lichens below the tree‐line (4000–4200 m a.s.l.), and thus their equatorial habitat is almost exclusively restricted to the alpine zone between the tree‐line and the snow‐line (4700–4800 m a.s.l.). The equatorial species mainly reproduce asexually by thalloconidia, and the adaptive significance of this type of reproduction in high altitude habitats is discussed.

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“…Nyl. Nonetheless Hestmark (1990) showed that the species is distinct from the aforementioned species in that the asexual thalloconidia (anamorphs) generated on the lower side of U. nylanderiana are unicellular while those of U. polyphylla are multicellular, and that neither U. hyperborea nor U. arctica produce thalloconidia but solely rely for their propagation on sexually generated ascospores from apothecia. In a study of the teleomorph-anamorph relationships in Umbilicaria, Hestmark (1991) further argued with reference to thallus morphology that U. nylanderiana is a sister species to the more northern U. arctica which is usually richly fertile with apothecia (teleomorphs) producing sexually generated ascospores.…”

Section: Introductionmentioning

confidence: 94%