. ▁past oris . ▁The ▁species ▁was ▁split ▁into ▁K . ▁ph aff ii , ▁K . ▁past oris , ▁and ▁K . ▁pseud op ast oris . ▁ ▁P . ▁past oris ▁in ▁nature ▁ ▁Natural ▁habitat ▁Natur ally , ▁P . ▁past oris ▁live ▁on ▁trees ， such ▁as ▁ ▁ch est nut ▁trees . ▁They ▁are ▁heter ot roph s ▁and ▁they ▁can ▁use ▁several ▁carbon ▁sources ▁for ▁living , ▁like ▁gl uc ose , ▁g ly cer ol ▁and ▁m eth an ol . ▁ ▁However , ▁they ▁cannot ▁use ▁la ct ose . ▁ ▁Re production ▁P . ▁past oris ▁can ▁under go ▁both ▁a sex ual ▁reprodu ction ▁and ▁sexual ▁reprodu ction , ▁by ▁bud ding ▁and ▁as cos p ore . ▁In ▁this ▁case , ▁two ▁types ▁of ▁cells ▁of ▁P . ▁past oris ▁exist : ▁ha p lo id ▁and ▁dip lo id ▁cells . ▁In ▁the ▁a sex ual ▁life ▁cycle , ▁ha p lo id ▁cells ▁under go ▁mit osis ▁for ▁reprodu ction . ▁In ▁the ▁sexual ▁life ▁cycle , ▁dip lo id ▁cells ▁under go ▁sp or ulation ▁and ▁me ios is . ▁ ▁The ▁growth ▁rate ▁of ▁its ▁colon ies ▁can ▁vary ▁by ▁a ▁large ▁range , ▁from ▁near ▁to ▁ 0 ▁to ▁a ▁dou bling ▁time ▁of ▁one ▁hour , ▁which ▁is ▁suitable ▁for ▁industrial ▁processes . ▁ ▁P . ▁past oris ▁as ▁a ▁model ▁organ ism ▁In ▁the ▁last ▁few ▁years , ▁P . ▁past oris ▁was ▁investig ated