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.
Division Marchantiophyta&#151Liverworts, genus Marchantia. : The thallus of the haploid gametophyte (n) grows flat on moist ground, and it is many-cells thick. Pores to permit gas exchange are in the top surface, and there are air spaces within the top zone of the thallus. Water is absorbed throughout the surface.
A calla lily is better off looked at than eaten. The calla lily (Zantedeschia aethiopica) is a versatile perennial that can fulfill a variety of roles in the home landscape, from tropical specimen plant to potted house plant or elegant cut flower.ome people also find value in the plant as a food source, as its leaves are edible when cooked. Eating any part of the plant is quite dangerous however, as calla lilies contain toxic calcium oxalate crystals.