PROBLEM TO BE SOLVED: To provide cultivation methods that can harvest Hypsizygus marmoreus in a stump state without a hard tip, the mushroom not coming apart even if the hard tip is cut off.SOLUTION: Disclosed is a cultivation bottle cap 10 of Hypsizygus marmoreus having a cylindrical member 20 that fits into a wide mouth portion 54 of a cultivation bottle 50, the cylindrical member 20 having a large diameter cylinder part 22 that covers and fits the end edge of the wide mouth part 54 and the outer side surface in the vicinity of the end edge, a small diameter cylinder part 24 that has a first aperture 21 having a smaller diameter than the large diameter cylinder part 22 and is positioned at a center side, and a connecting part 25 that connects the outer peripheral edge of the large diameter cylindrical part 22 and the small diameter cylinder part 24, as well as the height of the inner side surface 15 of the small diameter cylinder part 24 being from 6 mm or more to 30 mm or less.SELECTED DRAWING: Figure 10【課題】石突き部分を切断してもキノコがばらばらにならず、石突きのない株状のブナシメジを収穫することができる栽培方法を提示する。【解決手段】栽培ビン50の広口部54に嵌合する筒状部材20を有するブナシメジ栽培ビンキャップ10であって、前記筒状部材20は、前記広口部54の端縁及び該端縁の近傍の外側面を覆い嵌合する大径筒部22と、該大径筒部22より小径な第１開口部21を有しかつ中心側に位置する小径筒部24と、前記大径筒部22の外周縁と前記小径筒部24とを連結する連結部25と、を有し、前記小径筒部24の内側面15の高さが６ｍｍ以上３０ｍｍ以下である。【選択図】図１０
