In the article, virtual collections (VC) are considered as elements of the Common Digital Space of Scientific Knowledge (CDSSK). VCs are structured sets of digital objects (images, texts, audio, video, 3D-models) linked by certain features and are an effective tool for popularizing science and culture. Using the example of a virtual mycological collection, the main stages of uploading external VCs to the CDSSK are shown, including the use of the Integrated Automated Museum Information System and the BRE (Big Russian Encyclopedia), which are the most widespread in Russian museums.