crustose lichen
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Author(s):  
Snigdha Majumder ◽  
S.N. Sinha

Lichens are universally distributed organism occurring in varied climatic condition ranging from the poles to the tropics in earth. The study  of lichen remains quite frowzy throughout the world. Though the importance of lichen in an ecosystem is very high in its own way. Lichens are just like miniature sponges that take up everything that comes their path, including air pollution (Fleishner, 1994). They synthesise many useful secondary metabolites. Among the synthesised metabolites, many of them have antiviral and antibacterial activity. To keep this view in mind the present study has done to to evaluate the antibacterial activity of two different crustose lichen species collected from Kalyani University Campus,WB. Since this is the first time study of antimicrobial activity of Cryptothecia striata and Cryptothecia scripta .


2021 ◽  
Vol 25 (01) ◽  
pp. 103-116
Author(s):  
Jair Putzke ◽  
◽  
Adriano Luis Schünemann ◽  
Antonio Batista Pereira

Antarctica is one of the most extreme environments on the planet considering the climatic conditions. This greatly limits the development of plants, and is reflected in slow growth, especially in the lichens present in this environment. Haematomma erythromma is a nitrophile lichen easily identifiable by its color and was the species chosen to evaluate growth in Antarctica. Using a plastic sheet, squares of 20 x 20 cm were placed on eight different rocks with crustose lichen communities and the species found were drawn in 1992 and in 2012. The location chosen for the survey was Stinker Point, on Elephant Island, north of the South Shetland Archipelago. After 20 years and evaluating 178 thalli, H. erythromma grew 0.2 to 0.7 mm/year, one of the slowest among Antarctic lichens. The thallus growth is mainly oriented West/Northwest, against prevailing wind direction, probably due to nutrient carried form a penguin rockery nearby. New thalli formed during this evaluation and the old ones also grew to connect each other, resulting in a confluent larger thallus. The new thalli grew mostly over Xanthoria elegans (Link.) Th. Fr., Rhizoplaca aspidophora (Vain.) Redón and Buellia spp. demonstrating that H. erythromma is capable of colonize areas with other lichen species coverage. The growth to be confluent with other thalli and the wind orientation are novelties to this species of lichen.


2020 ◽  
pp. 509-514
Author(s):  
Scott LaGreca

A crustose lichen species new to science – previously characterized in the literature but unnamed – is formally described. This new species, Chrysothrix bergeri sp. nov., ranges from the southeastern United States southwards to the Caribbean islands (Bahamas and Cuba) and eastwards to Bermuda. It is most easily confused with C. xanthina, from which it differs in both chemistry and ascospore shape. Bilimbia aurata and Bilimbia stevensoni are both confirmed as synonyms of C. xanthina. A lectotype is selected for Bilimbia aurata. Solvent E is recommended for the chromatographic separation of leprapinic and pinastric acids – two lichen secondary products critical for diagnosing certain species of Chrysothrix, including C. bergeri.


2020 ◽  
pp. 120-130
Author(s):  
Harrie Sipman ◽  
André Aptroot

The new species Ikaeria serusiauxii (Teloschistaceae, lichenized Ascomycetes) is described from the Madeira Archipelago, Canary Islands and continental Portugal. It is a crustose lichen on twigs and branches of trees and shrubs in xerophytic maritime vegetation. Superficially it is similar to Caloplaca cerina and C. haematites, from which it differs by the often black apothecium margin, very thick spore septa, black pycnidium ostioles, and the presence of the pigment Cinereorufa-green instead of Sedifolia-grey. ITS sequences suggest Ikaeria aurantiellina (syn. Caloplaca aegatica) as the closest relative. Added is a preliminary lichen checklist for Porto Santo (Madeira Archipelago, Macaronesia).


2019 ◽  
Vol 52 (3) ◽  
Author(s):  
Farhana Ijaz ◽  
Niaz Ali ◽  
Abeer Hashem ◽  
Abdulaziz A. Alqarawi ◽  
Elsayed Fathi Abdallah

2019 ◽  
Author(s):  
Yongwon Kim ◽  
Sang-Jong Park ◽  
Bang-Yong Lee

Abstract. Soil CO2 efflux-measurements represent an important component for estimating an annual carbon budget in response to changes in increasing air temperature, degradation of permafrost, and snow-covered extents in the Subarctic and Arctic. However, it is not widely known what is the effect of curstose lichen (Ochrolecia frigida) infected sphagnum moss on soil CO2 emission, despite the significant ecological function of sphagnum, and how lichen gradually causes the withering to death of intact sphagnum moss. Here, continuous soil CO2 efflux measurements by a forced diffusion (FD) chamber were investigated for intact and crustose lichen sphagnum moss covering over a tundra ecosystem of western Alaska during the growing seasons of 2015 and 2016. We found that CO2 efflux in crustose lichen during the growing season of 2016 was 14 % higher than in healthy sphagnum moss community, suggesting that temperature and soil moisture are invaluable drivers for stimulating soil CO2 efflux, regardless of the restraining functions of soil moisture over emitting soil carbon. Soil moisture does not influence soil CO2 emission in crustose lichen, reflecting a limit of ecological and thermal functions relative to intact sphagnum moss. During the growing season of 2015, there is no significant difference between soil CO2 effluxes in intact and crustose lichen sphagnum moss patches, based on a one-way ANOVA at the 95 % confidence level (p 


2018 ◽  
Vol 121 (4) ◽  
pp. 498-512 ◽  
Author(s):  
Carly R. Anderson Stewart ◽  
James C. Lendemer ◽  
Kyle G. Keepers ◽  
Cloe S. Pogoda ◽  
Nolan C. Kane ◽  
...  

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