Abstract: The growth of filamentous microorganism is contributed by tipextension and branching. The
microscopic growth of filamentousmicroorganism means the growth process from one or a few
spores.In order to describe the microscopic process, a populationmorphologically structured
model is proposed, in which three morphologicalcompartment andtheir interactions were
considered, and the heterogeneity of hyphal growthwas included. The model was applied to
describe the microscopic growth of Streptomyces tendae and Geotrichum candidum with good
agreement. From modelprediction, it is concluded that if the number of hyphae is large
enough(macroscopic growth), the specific growth rate of filamentous microorganismand the
ratio of morphological forms in hyphae will become constant.

Key words: population morphologically structured model, filamentous microbe, Streptomyces tendae, Geotrichum candidum

摘要： The growth of filamentous microorganism is contributed by tipextension and branching. The
microscopic growth of filamentousmicroorganism means the growth process from one or a few
spores.In order to describe the microscopic process, a populationmorphologically structured
model is proposed, in which three morphologicalcompartment andtheir interactions were
considered, and the heterogeneity of hyphal growthwas included. The model was applied to
describe the microscopic growth of Streptomyces tendae and Geotrichum candidum with good
agreement. From modelprediction, it is concluded that if the number of hyphae is large
enough(macroscopic growth), the specific growth rate of filamentous microorganismand the
ratio of morphological forms in hyphae will become constant.

关键词: population morphologically structured model;filamentous microbe;Streptomyces tendae;Geotrichum candidum