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In the photomicrograph you can see the stretched cuticle (epidermis) of the nematode that has been pulled away from the inner layer (hypodermis) as the nematode struggles to escape the  chemical bonding between its cuticle and three stephanocysts (marked x).

Hyphoderma is a resupinate (flat) genus in the Thelephoraceae (family) of the Basidiomycota (Division containing mushrooms).   On the hyphae of some species two-celled structures called 'stephanocysts' are produced.   For many years these were merely a curiosity and their function was unknown.  In Taiwan, Tzean and Liou (1993) made the exciting discovery that the function of stephanocysts was to capture and consume nematodes.   The photomicrograph above demonstrates this phenomenon.