Even MORE Lichen

I went back to Camelback Wednesday to try to find another fern to get a better picture without having to hike half way up.  I found a semi-isolated little wash with a bunch of lichens I'm pretty sure I've never seen before.

I don't have the ID for these, but when I do I'll post them. Pretty cool, though, spotted and bi-color!

Here are more spotted ones, but are they a seperate sp? These appear to be greenish then turn tan, while the other one above seems whiter and maybe a bit greyish.  Knowing as little as I do, I can't say.  When I find out, I will post the results...

Fringed and some others...

Darker colors as varitation within the same species or different species? The black ones different from those identified earlier? Again, we'll have to wait and see...

So here could be another 4 -7 new ones here. New to me, that is!

Lichen - a Small Sampling

Click the pictures below for a larger view, some are well worth the closer look...

OK, here are the Big 3 again.  They are likely to pop up in most of the following pictures.

Pale green one is a Xanthoparmelia species

Rust one is a Caloplaca species

Yellow-green one is Acarospora socialis

Acaraspora socialis looking exceptionally lush after the rains.

Xanthoparmelia - X. weberi

This one radiates out from a central spot and continues growing outward after the older, middle section dies off. 

There are some ways to determine age by size & growth rates, and there are lichen over 1,000 years old.  Not surprizing, I suppose, as there are living pine trees over 4,000 years old, but there are some lichen believed to have been around 10,000 yrs or so!

Lichinella crebillifera

If I weren't aware that it had just rained (and rained) the week before, I may have passed over lichen such as these believing them to be dead.  The largest of these would barely cover your thumbnail.

Placidium laciniatum (brown) and Peltula sp. (olive)

Some more lichen species I never would have known existed before deciding to take a closer look. None of these are as big as the eraser on the end of a pencil

Placidium laciniatum - a very common brown soil lichen

This amid some of the more commonly found lichen.

I have to admit, these things are way cooler up close and personal.  They are pretty amazing to be able to survive in the desert.  But then there are lichen in the arctic and just about everywhere else.

Again, thanks to Tom Nash of ASU.  Visit the ASU website for more on lichen.

Lichen - an introduction

Hiking up Camelback Mtn the other day I was once again impressed by the proliferation of yellow-green lichen following a good winter rain.  I decided to take some pictures and got a bit of a surprise with some of the results.  This shot is actually from Papago Park (pretty much same sandstone conglomeration as the head of Camelback) and shows the big three. The most common lichen you'll find easily without really looking for them.

Pale green one is a Xanthoparmelia species

Rust one is a Caloplaca species

Yellow-green one is Acarospora socialis

The names alone aught to impress you. That I should be able to identify them - not as impressive. I enlisted the help of ASU Professor Tom Nash to identify these and the others.  ASU is part of the North American Consortium of lichen herbariums.  The ASU website ASU herbarium for lichen  has pictures to help identify lichen, but as they are listed by scientific names and not by colors or other identifying factors, I wasn't about to go through and click species after species to luck upon the correct one.  Definitely a site for those who know a bit about lichens! I never would have dreamed there are so many different kinds of lichen.

What are Lichen?

Simply put, lichen are a combination of algae and fungi.  Algae is found pretty much everywhere in the world - in water, on land, high mountains, low valleys, wet soils and dry places.  Fungal spores can pretty much go where the wind blows, which is also pretty much everywhere in the world, and sure enough, you can find lichen just about anywhere.  They have a unique adaptation and symbiant relationship that allow them to survive even the driest climes. 

The algae conduct photosynthesis and provide nutrients...the fungus uses this to grow, obviously. When it rains after an extended period of drought, the fungus cannot immediately begin growing again - the water begins a process in which nutrients are broken down which in turn both the algae and the fungus use.

There are way more complicated explainations out there and you can google lichen to learn more than you may ever need to know about them. One thing about the algae - there is a simpler bacteria form called cyanobacteria which may be a host. And just as algae & bacteria take on a myriad of colors in their various blooms, so do the lichen.