QUICK FACT: Dormant samples have survived trips to space for about two weeks.

THREATS: Generally hardy, but it is sensitive to places with heavy nitrogen pollution.

IMPORTANCE: A tough pioneer on silica-rich rocks, it helps scientists study survival in extreme environments.

Photo credit: Rebecca Yahr

QUICK FACT: Dormant samples have survived trips to space for about two weeks.

THREATS: Generally hardy, but it is sensitive to places with heavy nitrogen pollution.

IMPORTANCE: A tough pioneer on silica-rich rocks, it helps scientists study survival in extreme environments.

Photo credit: Rebecca Yahr