Each cell or group of cells of the photobiont is usually individually wrapped by hyphae, and in some cases penetrated by an haustorium.
From the en.wikipedia.org
However, the chalazal region forms a single-celled haustorium, a structure that absorbs nutrients and ultimately degenerates to form an empty space in the seed.
From the sciencedaily.com
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A root-like attachment in parasitic plants that penetrates and obtains food from the host
In botany, a haustorium (plural haustoria) is the hyphal tip of a parasitic fungus or of the root of a parasitic plant (such as in the broomrape family; also mistletoes), that penetrates the host's tissue, but stays outside the host cell membrane.
The morphologically modified root which physically connects the parasite to the host. May be a primary haustorium if the radicle apex is directly transformed into a haustorium (e.g. ...
The organ by which a parasite absorbs nutrients from the host plant. In longitudinal section it resembles a root ball in structure.
A specialized branch of a hypha formed inside a host cell by certain plant-parasitic fungi (especially obligate parasites) in order to obtain nutrients. (Pl. haustoria.) (16)
In certain symbiotic fungi, specialized hyphae that can penetrate the tissues of host organisms.
A specialised hyphal invagination of plant cells. Commonly found in biotrophic associations. Thought to be the site of uptake of organic nutrients by the fungus.
Specialized roots of parasites for obtaining nutrients/water from a host
A projection of hyphae into host cells which acts as an absorbing organ