1 The sun's rays are strongest during the hours of 10 a.m. to 4 p.m. The sun's rays are also stronger at higher altitudes and lower latitudes (closer to the tropics). Reflection off water, sand, or snow can make the sun's burning rays stronger.  Sun lamps can cause severe sunburn.
Marchantia polymorpha, sometimes known as the common liverwort or umbrella liverwort, is a large liverwort with a wide distribution around the world. It is variable in appearance and has several subspecies.
Not to be confused with the genus of flowering plants, Hepatica, that may also be called liverwort. The Marchantiophyta /mÉrËkaentiËÉfÉ¨tÉ/ mÉrËkÃ¦ntiËÉfÉ¨tÉ are a division of-non vascular bryophyte land plants commonly referred to as hepatics or. liverwortsoday, liverworts can be found in many ecosystems across the planet except the sea and excessively dry environments, or those exposed to high levels of direct solar radiation. As with most groups of living plants, they are most common (both in numbers and species) in moist tropical areas.