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Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20150224172131/http://www.ucmp.berkeley.edu:80/fungi/lichens/lichensy.html
There are as many as 20,000 different kinds of lichen known, and new ones
being discovered all the time. These are treated as species by lichenologists,
but are not species in the same sense as animal or plant species.
Because lichens are formed through a combination of alga and fungus,
it is not possible to study the phylogeny of lichens, per se. Rather, the
relationships of the fungal partner and the algal partner must both be studied.
The algal partner is usually a unicellular pleurastrophycean
green alga, such as Trebouxia,
Pseudotrebouxia, or Myrmecia, or is often a
cyanobacterium, such as
Nostoc or Scytonema. The fungal partner may be an
Ascomycete or Basidiomycete.
Current work on the systematics of lichens is focussed on the question
of the origin of lichens, and particularly to answer "How many times have
lichens originated among fungi?" We know that lichens have developed
independently in the Ascomycota and Basidiomycota, but no one is entirely
certain how many times lichenization has occurred in each of these
groups.
For more information on the systematics of lichen fungal partners, visit the
Tree of Life
