Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.
In 1993, taxol was discovered as a natural product in a newly described endophytic fungus living in the yew tree.  It has since been reported in a number of other endophytic fungi, including Nodulisporium sylviforme ,  Alternaria taxi , Cladosporium cladosporioides MD2 , Metarhizium anisopliae , Aspergillus candidus MD3 , Mucor rouxianus sp. , Chaetomella raphigera , Phyllosticta tabernaemontanae , Phomopsis , Pestalotiopsis pauciseta , Phyllosticta citricarpa , Podocarpus , Fusarium solani , Pestalotiopsis terminaliae , Pestalotiopsis breviseta , Botryodiplodia theobromae Pat. , Gliocladium sp. , Alternaria alternata var. monosporus , Cladosporium cladosporioides , Nigrospora sp. , Pestalotiopsis versicolor , and Taxomyces andreanae . However, there has been contradictory evidence for its production by endophytes, with other studies finding independent production is unlikely.