What is mean by prostrate and erect thallus which is found in bryophytes?explain in simple language.

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Erect means upright in position. Mosses have erect thallus which grows upright.  Their thallus is differentiated into root-, stem- and leaf-like structures.
Prostrate means a downward position of thallus which is stretched on the ground. 

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The gametophyte plant body is called a thallus, which means that it lacks xylem and phloem and therefore does not have true stem, true leaf or true root. ... Some gametophytes are erect and some are prostrate(bend); but bryophytes lack lignin biosynthesis capacity, so they are never tall.
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