Each directives page on eur-lex has a "national transposition" page. For example, directive 2009/65/EC, concerning UCITS, is available at https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=celex:32009L0065.
There is a navigation box at the top left with several relevant pages:
- Document information
- National transposition
- Summary of legislation
(Before the recent site redesign, these were shown as tabs across the top of the page, so for the lack of a better term, I will call these "tabs.")
The Document information tab shows, among other metadata, relationships with other EU acts. One useful section on this page is the All consolidated versions section, which is a set of links to consolidated versions of the document, indicated by date.
The answer to your question is the National transposition tab, which shows "National transposition measures communicated by the Member States." It is worth noting the disclaimer:
The member states bear sole responsibility for all information on this site provided by them on the transposition of EU law into national law. This does not, however, prejudice the results of the verification by the Commission of the completeness and correctness of the transposition of EU law into national law as formally notified to it by the member states. The collection National transposition measures is updated weekly.
The list of national acts is in the form of links, which lead to pages that seem designed to present the text of the national legislation, but in the examples I have checked say nothing more than "Text is not available." Perhaps there are some instances, or will be in the future, where these contain links to national legal information sites. As it is, there is enough information to enable one to search the national sites to find the relevant legislation.