Wenvir Leyson

Lichen Molecular Biology Researcher

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  • Profile picture of Wenvir Leyson who took this action.

    Wenvir Leyson added an association between "Pseudocyphellaria intricata" and "Peltigerales".

    about 1 year ago

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    Wenvir Leyson commented on "Pseudocyphellaria intricata":

    Threats & Conservation Status The Welsh population of this lichen is Critically Endangered being confined to two mature ash trees and consisting of fewer than 20 individual thalli. Whilst producing a number of vegetative propagules they are small in number compared to the number of spores a regularly fertile lichen could produce (this species has never been found fertile in Europe). The wood is owned and managed by the National Trust, Scheduled as an SSSI and there is a good continuity of mature ash trees in the vicinity though there are very few trees as large as the two it has been located on. Acid rain has probably rendered the bark chemistry of many trees in this wood too acidic for this species. Basic rock outcrops occur close by and could have been a refugium for this lichen if the wood was ever clear felled in the past. The outcrops may currently be too shaded for this species. It is note worthy that the trees supporting this species are at the edge of large glades and the lichen occurs only on the best-lit sides. Grazing pressure by goats and possibly sheep is currently so high as to suppress all woody regeneration. On the positive side ivy, holly and rhododendron pose no threat. The trees are very large and large canopies may lead to a high risk of wind throw. Tree surgery to lighten the canopies may be desirable. Due to the extensive population in Scotland the British national conservation status is considered to be Near Threatened. It is a BAP species and is listed on Schedule 42 of the NERC Act in Wales. British populations are considered to be of International Importance. References Leighton, W.A. (1879).The Lichen Flora of Great Britain, Ireland and the Channel Isles. Privately printed Shrewsbury.> Pentecost, A (1987). The lichen flora of Gwynedd. Lichenologist 19:1-166. Rose, F. & Coppins, B.J. (1998). Species account 1196/1998 in Lichen Atlas of the British Isles. (ed. M.R.D. Seaward) British Lichen Society, London.

    about 1 year ago

  • Profile picture of Wenvir Leyson who took this action.

    Wenvir Leyson added an association between "Pseudocyphellaria intricata" and "Lobariaceae".

    about 1 year ago

  • Profile picture of Wenvir Leyson who took this action.

    Wenvir Leyson commented on "Pseudocyphellaria intricata":

    "This is a substantial foliose lichen with, when moist, a brown (café au lait) thallus that becomes grey-brown on drying out. Its surface is smooth, though it may develop rather weak ridges. The purple grey coloured eruptions of soralia along the lobe margins may spread as scattered dots or somewhat more elongated squiggles over the surface of the thallus. They are a prominent feature. It might be mistaken for a Sticta, Nephroma or a Peltigera. The undersurface of Pseudocyphellaria and Sticta is covered in a dense, dark brown stubble of rhizines amongst which are small sunken bald patches, called pseudocyphellae in this species and give it its generic name and the English name of the Americans-the speckle bellies and true cyphellae in Sticta. In practice the differences between theses structures can only be observed with difficulty under a microscope. In Sticta limbata the undersurface and rhizines are much paler in colour and the rhizines less well developed and the lobes tend to be more or less circular in outline and remain discrete. P. intricata develops somewhat elongate overlapping lobes. S. sylvatica smells of fish when wet. Peltigera has large bushy, rather widely spaced rhizines and Nephroma a bare undersurface". Retrieved from:http://wales-lichens.org.uk/species-accounts/pseudocyphellaria-intricata

    about 1 year ago

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    Wenvir Leyson added an association between "Parmelinella wallichiana" and "Parmeliaceae".

    about 1 year ago

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    Wenvir Leyson commented on "Pseudocyphellaria intricata":

    This macrolichen was one of the rarest lichen in Baguio City. We only found 1 thallus during the field work.

    about 1 year ago

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    Wenvir Leyson commented on "Heterodermia speciosa":

    You can find the voucher of Heterodermia speciosa at Braeckman Natural History Museum, SLU, Baguio City. For inquiries contact wenvir@ymail.com

    about 1 year ago • edited: about 1 year ago

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    Wenvir Leyson created the community "Philippine Lichenologists".

    about 1 year ago