Borovik yana da kyau (Mafi kyawun jan naman kaza)
- Rarraba: Basidiomycota (Basidiomycetes)
- Yankin yanki: Agaricomycotina (Agaricomycetes)
- Darasi: Agaricomycetes (Agaricomycetes)
- Subclass: Agaricomycetidae (Agaricomycetes)
- oda: Boletales (Boletales)
- Iyali: Boletaceae (Boletaceae)
- Sanda: Jan naman kaza
- type: Rubroboletus pulcherrimus (Beautiful Boletus)
Wannan naman gwari na dangin Rubroboletus ne, a cikin dangin Boletaceae.
Takamaiman epithet pulcherrimus shine Latin don "kyakkyawa".
Kyakkyawan boletus nasa ne namomin kaza masu guba.
Yana haifar da tashin hankali na ciki (alamomin guba - gudawa, tashin zuciya, amai, ciwon ciki), guba ya wuce ba tare da wata alama ba, ba a sami rahoton mutuwa ba.
Yana da hat, diamita wanda aka samo daga 7,5 zuwa 25 cm. Siffar hular tana da huci, tare da ɗan ulu mai ɗan ulu. Launi yana da inuwa iri-iri: daga ja zuwa zaitun-launin ruwan kasa.
Naman naman kaza yana da yawa, yana da launin rawaya. Idan kun yanke shi, to, naman ya zama shuɗi akan yanke.
Kafar tana da tsayin 7 zuwa 15 cm, kuma faɗin cm 10. Siffar ƙafar ta kumbura, tana da launin ja-launin ruwan kasa, kuma a cikin ƙananan ɓangaren an rufe ta da jan ragamar duhu.
Tubular Layer ya girma tare da hakori, kuma tubules da kansu suna da launin rawaya-kore. Tsawon tubules ya kai bambanci na 0,5 zuwa 1,5 cm.
An zana pores na kyawawan boletus a cikin launin ja mai haske mai haske. Haka kuma, pores sukan juya shuɗi idan an danna su.
Furen foda yana da launin ruwan kasa, kuma spores ɗin suna da girman 14,5 × 6 μm, mai siffa mai siffa.
Borovik kyakkyawa yana da raga a kan kafa.
Naman gwari ya fi yaduwa a cikin gandun daji masu gauraye da ke yammacin gabar tekun Arewacin Amirka, da kuma a jihar New Mexico.
Kyakkyawan boletus yana samar da mycorrhiza tare da irin waɗannan bishiyoyi masu ban sha'awa: 'ya'yan itace na dutse, pseudo-suga yew-leaved da babban fir.
Lokacin girma na wannan naman gwari yana faɗowa a kan masu ɗaukar naman kaza a ƙarshen lokacin rani kuma yana kai har zuwa ƙarshen kaka.