What is Street Creatures?  This is the game I run on Twitter every Friday. I’ve
collected all the past quizzes here in one place so you can either relive them, or play
them for the first time.

How does it work?  Provided are four, seemingly unrelated clues, that are all
connected by a wild organism that can be found in a city. Look at the four clues,
do some research, and when you think you’ve figured it out, click on ‘Answer’
to reveal what connects the clues, and how they are connected.

Follow me on Twitter to play #StreetCreatures live every Friday at 9am PST.

Quiz #19 Clues

Doctrine of Signatures
Kunstformen der Natur
Biological Soil Crust

Answer (Don't click until you've solved it)

Liverwort (Hypatics)

Doctrine of Signatures:

During the middle ages this doctrine followed the belief to treat a certain part of the body, like liver, the plant should have a ‘signature’, looking like that body part. So liverwort was used to treat livers.

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Kunstformen der Natur:

Ernst Haeckel’s classic book of illustrations, ‘Kunstformen der Natur’, or ‘Art Forms in Nature’, contains many different types of organisms, including a page of liverworts.

Biological Soil Crust:

Although the soil between plants in arid regions looks bare, it’s actually covered in a complex mix of life including lichens, mosses, bacteria, algae and liverworts, creating a soil crust.

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Similar to mosses, liverworts have a complicated life cycle. Some reproduce sexually and others asexually. On those reproducing sexually, they contain antheridia (male) and archegonia (female), which grow on separate bodies.

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