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Whereas the importance of pollen as inhalative allergens has been largely investigated and is generally known, the experience in the frequency and the role of the sensibilization with air-borne fungi is relatively limited. In 720 patients with Asthma bronchiale the degree of sensitization has been tested with various extracts of air-borne fungi of SSW Dresden (mould mixture, aspergillin, mucor, cladosporium and penicillium and alternaria). The most frequent and also the strongest reactions were found with alternaria and the smallest part of positive skin reactions with penicillium. An isolated sensitization with mould has been demonstrated in 20 per cent of the cases. In 60 per cent of the tested patients a manifest mould allergy was shown by means of the Inhalative Allergen Test, the most favourable correlation between Intracutaneous Test (ICT) and Inhalative Test (IAT) was found with alternaria (76%). A conformance between ICT and basophils degranulation test (BDT) was stated in 69% of the cases. The aim should be comparable tests with allergen extracts without irritative effects and qualitative measurements of air-borne fungi.