Hypha

Definition and stakes

Harry Marshall Ward and Vernon Herbert Blackman,  1911 Encyclopædia Britannica (1911)

“ The outer parts of the mass then differentiate as a wall or investment, and the interior becomes a hollow, into which hyphal ends grow and abstrict the spores. Much more complicated are the processes in a large series of “fructifications,” where the mycelium first develops a densely packed mass of hyphae, all alike, in which labyrinths of cavities subsequently form by separation of hyphae in the previously homogeneous mass, and the hymenium covers the walls of these cavities and passages as with a lining layer. ”
Source: Wikisource

Harry Marshall Ward and Vernon Herbert Blackman,  1911 Encyclopædia Britannica (1911)

“ Such hyphae may be multicellular, or they may consist of simple tubes with numerous nuclei and no septa (Phycomycetes) , and are then non-cellular. In the more complex tissue-bodies of higher fungi, however, we find considerable differences in the various layers or strands of hyphae.
An epidermis-like or cortical protective outer layer is very common, and is usually characterized by the close septation of the densely interwoven hyphae and the thickening and dark colour of their outer walls (sclerotia, Xylaria, &c.)
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Source: Wikisource

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