Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Sarah Jovan
    Date: 2003
    Source: Bulletin of the California Lichen Society. 10(2): 29-35
    Publication Series: Scientific Journal (JRNL)
    PDF: View PDF  (550 KB)

    Description

    I examined the distributions of eight Physconia species in northern and central California: Physconia americana, P. californica, P. enteroxantha, P. fallax, P. isidiigera, P. isidiomuscigena, P. leucoleiptes, and P. perisidiosa. Distributions are based upon lichen community data collected for the Forest Inventory and Analysis Program in over 200 permanent plots. Physconia californica was not found while P. leucoleiptes was infrequent across the landscape, occurring sporadically around the periphery of the Central Valley. Physconia isidiomuscigena occurred only once in the study plots, growing Quercus sp. in Stanislaus county. This site is unusual in that this species is often saxicolous and known primarily from southern California. The remaining Physconia species were more frequent across the landscape with distributions centered in the Central Valley. I derived habitat models for these more common species using nonparametric multiplicative regression to help explain how distributions relate to environmental variables. Distributions of P. enteroxantha, P. isidiigera, and P. perisidiosa were well described by one or more environmental gradients while P. fallax and P. americana were only weakly associated with single predictors. Considering that many Physconia species are considered nitrophilous (nitrogen-loving), the habitat models would probably be better had an estimate of ammonia deposition been included. There are not, however, any comprehensive estimates of ammonia deposition for the study area.

    Publication Notes

    • You may send email to pnw_pnwpubs@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Jovan, Sarah. 2003. Distributions and habitat models of epiphytic physconia in north-central California. Bulletin of the California Lichen Society. 10(2): 29-35

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/25497