These are very often found upon the mucous membrnne of the mouth, the pharynx, the oesophagus, the intestinal canal, that is to say in fibrino-croupous, and especially in corroding, aphthous exudates. Aphthae and diphtheritis of the mouth and throat; croupous exudates in the same localities, in florid phthisis; croupous exudates in the larynx, oesophagus, etc, in the sequel to typhus.

They are assuredly not the morbific agent. The croupous exudates upon which they vegetate are cognizable to the naked eye, for those familiar with the subject, by a peculiar character, consisting in a viscid, curdlike turgescence, dingy yellow or tawny discoloration, and a broken or jagged aspect.

The fungi resemble those of favus. The thallus-threads are, however, mostly much longer, more slender, and have frequently at their free extremity protuberances replete with minute granules (spores). They often form very compact, felt-like tissues.

Amongst these funguses are, no doubt, to be counted the fungus Noma, of Klenke; those found by Bennett in the sputa and lungs, in a case of pneumo-thorax, as also in the black sordes upon the teeth, in typhous patients; again, those seen upon so-called typhus-ulcers in the intestines; lastly, the mould such as we ourselves once observed upon an old blood-clot, unattached within a bronchial sac.