Summary
Most of the hyphae forming the medulla of the stroma of the brown rot fungi are 4–7 μ in diameter and contain food reserves in large vacuoles and lipid bodies. Some stromatal hyphae have very thick walls and perform a protective function. Smaller hyphae (1–2 μ in diameter) form a network through the medulla and their structure suggests that they initiate the growth of vegetative hyphae and spores after the stroma has passed through a period of rest.
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Willetts, H.J., Calonge, F.D. The ultrastructure of the stroma of the brown rot fungi. Archiv. Mikrobiol. 64, 279–288 (1969). https://doi.org/10.1007/BF00417010
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DOI: https://doi.org/10.1007/BF00417010