Sarcodimitic tissue contains a mix of two types of hyphae: narrow and very broad, The broad hyphae are elongate (500-3000 micrometres long), fusiform (narrowing at the ends) and slightly to distinctly thick-walled. The narrow hyphae are usually branched, and are wrapped around the broad hyphae. When sarcodimitic tissue is present, the two types of hyphae of widely different diameter can be readily seen in a cross section of the stipe, and are also apparent in squash sections of the stipe trama. Sarcodimitic tissue may be better developed at the apex or base of the stipe (the latter particularly where there is a pseudorhiza).

Reference
Redhead, S. (1987), The Xerulaceae (Basidiomycetes), a family with sarcodimitic tissues, Canad. J. Bot. 65: 1551-1562.

Choose this state if: the hyphae of the stipe trama are relatively uniform in diameter, or with only occasional thinner hyphae.