Fungal Reservoirs

Fungal Reservoirs are specialized interstitial zones within the Tower’s architecture where fungal unrealities are permitted limited, sanctioned growth to serve a custodial or atmospheric function. They are classified as a subtype of Somatic Aquifers, distinct in their use of biological rather than purely psychic structures to contain and modulate Vestigial Dread and other designated emotional states.

Architectural and Biological Structure

Fungal Reservoirs are typically established within stone chambers, disused ductwork, or the foundational strata between numbered floors. The primary cultivant is almost invariably a strain of Genus Somniferum primus, selectively bred for docility and low sporulation. The fungal mass forms a dense, pulsing mycelial mat that lines the chamber walls, floor, and ceiling, effectively creating a living, breathing room. These mats are psychotropic, capable of absorbing ambient emotional residue—particularly dread, anxiety, and melancholy—and metabolizing it into a harmless, faintly sweet-smelling gas or a bioluminescent glow.

The most famous example is Aethelreds Permanent Glow, a crystallized growth in Aethelreds Quarry that provides perpetual, low-level illumination, supplanting the need for traditional lamp maintenance by the Lamplighters Union. This has been a point of contention, referenced in the Codicil of Lumen disputes of Year 798.

Establishment and Governance

The protocol for designating a Fungal Reservoir is outlined in Concordance 17, Annex C, which extends the classification of ‘documentary detritivores’ to include “any fungiform entity demonstrably capable of processing non-corporeal ephemera.” Formal proposal must be made by a recognized Guild Mycologist and requires tripartite approval from the Cartulary of Containment, the local Ambient Reservoirs bureau, and the Keeper of the relevant floor.

Once established, the Reservoir falls under the maintenance purview of the Cultivators’ League, a sub-guild charged with quarterly inspections, nutrient balancing, and spore-harvesting for archival study. The legal status of by-products, such as harvested spores or glow-dust, is ambiguously addressed across the Sixth Concordance (which claims them for the Tower’s general fund) and the Eighth Concordance (which grants usufruct rights to the maintaining Guild). This contradiction is routinely litigated in the Hall of Precedents.

Functional Taxonomy

Fungal Reservoirs are categorized by their primary atmospheric output, aligning with the states managed by Ambient Reservoirs:

• Dread-Sinks: The most common type. Mycelia are tuned to absorb and neutralize sharp spikes of Vestigial Dread, converting it into a heavy, inert loam. These are often found near archival wings holding traumatic unrealities.
• Curiosity-Filters: Employ strains that thrive on Lingering Curiosity, producing faint, drifting spores that induce a state of focused calm, deemed conducive to scholarly review.
• Stasis-Weavers: The rarest and most delicate. These reservoirs maintain Charged Stasis by emitting chrono-sedative particulates, similar to those of the contained Soporific Spore Specimen 44Δ-7. Their operation is a closely guarded secret of the Guild.

Notable Incidents and Controversies

The Year 742 Incident, wherein a cultivated strain of Genus Somniferum primus breached containment in Annex Delta, is the seminal case study in Reservoir failure. The subsequent “Great Lethargy” that affected three administrative spirals for a fortnight led to the strict sporulation ceilings enforced today.

A persistent scholarly debate, known as the Symbiosis Question, centers on whether Fungal Reservoirs truly contain unrealities or instead enter into a symbiotic relationship with them. The traditional view, supported by the Cartulary, holds the former. Revisionists, notably the mycologist Lysander Parch, argue that the fungi become “documentary detritivores” in a literal sense, slowly digesting and altering the unrealities they are meant to simply buffer, as observed in Vellum Rotundas. This would imply the Archive is being subtly rewritten by its own custodial systems, a notion the Librarians have officially dismissed as “procedural paranoia.”

Interdepartmental Relations

The existence of Fungal Reservoirs creates unique jurisdictional overlaps. The Clockwork Lamplighters view bioluminescent reservoirs like Aethelred’s as a threat to their charter under the First Edict of Lamps. The Cultivators' League and the Guild of Spore-Tenders are in a constant, polite rivalry over breeding rights and strain patents. Furthermore, Ambient Reservoirs bureaus rely on the fungal networks for emotional climate control but must report any anomalous growth to the Containment Cartulary, creating a taut web of mutual dependency and suspicion.

Ultimately, the Fungal Reservoir stands as a testament to the Tower’s pragmatic, if perilous, approach to curating nonexistence: when a problem of atmosphere arises, the solution is often cultivated, not constructed.