We begin with Lichen and end with a bear....

This is a jar full of lichen I picked up off the ground in my yard. I made photo developer out of it.  
I added tap water to the lichen and let sit out in the sun for two days.
BTW- this is 16 oz. filled to the rim.

It smelled very green! Refreshing! Lichen sun tea! But don't drink it...use it for an eco friendly film developer.

After two days outside in the sun, ( I added a bit of water due to evaporation), I strained the lichen water into a bigger jar. I tossed the leftover lichen into my compost heap. Eco all the way!

Next, just because I like to know, I tested the pH of the lichen water. It read 5.5, acidic.

Then I mixed up the developer.

I added
4 teaspoons washing soda 
1 teaspoon vitamin C powder 
to the room temperature (70 F) lichen water to make 16 oz. of developer.

 The mixture looked a bit cloudy, like this. It still smelled green and fresh.

I tested the pH again...and it read 11. If you are familiar with caffenol recipes, most of them range around 9 pH. I didn't worry too much about the level being higher since this was just experimental.

I'm mostly interested in seeing how well something I found in my yard works for developing film with the addition of a couple of easy to find ingredients. 

Using the recipe above, I developed a sheet of Ilford Ortho Plus 4x5 sheet film for 10 minutes. It's in the fixer in the photo below.

Here's the scanned negative. The photo was made in a homemade pinhole camera that I made out of a leftover priority mailing box. 

That's not a great photo, but you can see the developer worked fine. I developed for 10 minutes, then stopped with water, fixed as normal, rinsed and let air dry.
Here's another photo made by scanning one of the 120 negative pinhole shots in the same lichen developer.

and one more 120 negative scan of some lichen....

I need to back track a bit and mention that right after I loaded the first 4 x 5 sheet of film in the developing tube I saw a bear in my driveway! They wander around looking for water and food. I scared it off with an air horn.

Back to developing with lichen...
I wound up developing a total of five, Ilford Ortho plus 4x5 sheet films and one roll of 120 Ultrafine 100 ISO medium format film. Each for a time of ten minutes.

The last sheet of 4 x 5 film I developed was pretty weak and thinking about this now, I'd say don't use it for more than four sheets of 4 x5, or two rolls of 120.

I've been using caffenol for about seven years so this was not too far a leap to make using lichen. I've also used pulverized juniper berries and it was very aromatic. 

Have fun! 
Experiment!
Be fearless!
Watch out for bears!