Ohio Biological Survey, Bull. 10, Vol. 11, No. 6: The Ascomycetes of Ohio IV and V

In Short

This volume serves as a comprehensive taxonomic record of two distinct lichen families within the state of Ohio. It functions as both a field guide and a reference document, detailing the physical structures, reproductive habits, and geographical distribution of numerous species. By providing structured keys and detailed descriptions—often supplemented by microscopic analysis—the work establishes a foundation for identifying these organisms in situ. It has endured as an essential historical reference for mycologists and botanists interested in the specific biodiversity of the Midwest during the early twentieth century.

The Story

The narrative of this work is one of rigorous systematic inquiry. The book begins by addressing the Lecideaceae, a family of lichens defined by their crustose thalli and specific apothecial structures. The text argues that the Lecideaceae should be understood through the lens of modern systematic mycology, positing that these lichens evolved from non-lichenized, Patellaria-like fungal ancestors. The progression of the argument moves from these broad evolutionary considerations to the granular detail of the family’s structural development, tracing the advancement from simple to complex spores and the refinement of the thallus.

As the study advances, the focus shifts to the practical realities of fieldwork. The author describes years of patient collection throughout various Ohio counties, noting the difficulty of detecting many of these minute, often evanescent organisms. The text then transitions into a formal systematic account, providing a structured hierarchy of genera—including Lecidea, Biatorina, Bilimbia, Bacidia, Buellia, and Rhizocarpon. For each genus, the reader is guided by a systematic key, followed by descriptive entries for individual species, such as Lecidea coarctata or Bacidia rubella. These entries are dense with precise measurements of apothecia, the color and texture of the thallus, and the specific substrata where they were found, ranging from limestone and granite to the bark of living trees and decaying logs.

Following the extensive treatment of the Lecideaceae, the narrative shifts to the Peltigeraceae, curated by Leafy J. Corrington. The tone remains clinical and descriptive, contrasting the foliose structure of these lichens with the previous family. The discussion centers on the clear morphological distinctions between the two covered genera, Peltigera and Nephroma, particularly regarding the presence or absence of a cortex on the lower surface and the placement of the apothecia. The arc concludes with a detailed examination of seven Peltigera species and one Nephroma species, highlighting their specific environmental requirements and their rarity within the state. The document wraps up by consolidating the collected knowledge into a reference index, serving as a permanent map of where these lichens were recorded in the various landscapes of early twentieth-century Ohio.

How It Unfolds

The evolutionary premise The text opens with an argument situating the Lecideaceae within the broader development of fungi. It suggests that these lichens share significant structural traits with non-lichenized ancestors, establishing a biological context for the systematic descriptions that follow.

The survey methodology The author outlines the rigorous process of gathering specimens across a wide range of Ohio counties. This section emphasizes the necessity of microscopic study to confirm the genus of species that appear superficially identical.

The systematic keys The body of the book is composed of keys designed to lead a researcher through a process of elimination based on spore shape, size, and cellular structure. These sections are technical, relying on the differentiation between hyaline and brown spores to categorize each specimen.

The species register Each entry provides a snapshot of a specific lichen, including its naming history, physical dimensions, and the specific county where it was collected. The narrative here is purely observational, documenting the presence and distribution of these organisms in the wild.

The final classification The transition to the Peltigeraceae mirrors the structure of the first section, applying similar taxonomic rigor to a different group of lichens. The book concludes by codifying these findings, ensuring the data is preserved for future botanical research.

The People

The work is primarily shaped by the professional perspective of Bruce Fink, the author of the first section. He acts as the guiding intelligence of the survey, driven by a desire to modernize the language of systematic mycology. He is a meticulous observer who acknowledges the limitations of his own field, noting that many of the species he describes are so minute or "evanescent" that they are easily overlooked by the untrained eye. His commitment to the Ohio Biological Survey manifests in his long-term dedication to specific regions, such as Butler County, where he spent fifteen years cataloging fungi.

Leafy J. Corrington serves as the primary voice for the second half of the book, focusing on the Peltigeraceae. Corrington displays a similar precision to Fink, though with a different emphasis, focusing on the architectural differences between genera like Peltigera and Nephroma. Corrington’s role is one of synthesis; by examining materials found by other collectors alongside those found by Fink, Corrington provides a comprehensive, albeit humble, look at the distribution of these lichens. Both figures are characterized by their extreme attention to detail, such as the use of camera lucida to create diagrams, and both prioritize the objective, empirical categorization of species over speculative narrative, leaving behind a legacy of taxonomic clarity.

In Its Own Voice

The Lecideaceae form a well-defined family of lichens, the affinities of which seem plainly marked.

The author establishes the scope of the study by defining the central family of the first section.

The superficial apothecial characters are so much alike in many of the species that one cannot always feel certain even of the genus of unfamiliar forms until he has studied them microscopically.

The author highlights the necessity of using advanced tools to correctly identify species that look the same to the naked eye.

Peltigera has a well-developed cortex on the upper side of the thallus only, while in Nephroma there is a well-developed cortex on both upper and lower sides.

The second contributor explains the core morphological difference that separates two major lichen groups.

What It's Really About

The book is an inquiry into the order and classification of the natural world. Beneath the technical descriptions lies the fundamental question of how to organize the complexity of biological life into a coherent, usable system. It touches upon the nature of evolutionary relationships, suggesting that the diverse forms of lichens are not random, but part of a lineage that links them back to non-lichenized fungi. The work is also about the importance of place, as it documents the specific botanical heritage of Ohio. Ultimately, it asks the reader to appreciate the "inconspicuous" elements of the environment, arguing that scientific knowledge is built upon the quiet, patient work of cataloging the small and often overlooked inhabitants of the earth.

Why Read It Today

This work is intended for those who appreciate the quiet intensity of scientific taxonomy. A reader with an interest in the history of botany or the specific natural history of Ohio will find deep value in the detailed species lists and the painstaking effort to define the state’s lichen population. It is a rewarding experience for anyone who enjoys the "detective work" of nature—the feeling of using a key to identify a minute organism found on a damp log or a patch of limestone.

However, the book is intentionally demanding. It does not offer a narrative arc in the traditional sense, but rather a structured, technical catalog. The reader must be prepared for a vocabulary steeped in early twentieth-century mycology, where terms like "apothecia," "hyphae," and "plectenchymatous" are used without simplification. There are no attempts to soften the difficulty of the subject matter; it assumes a level of botanical literacy that might be intimidating to a layperson. Yet, for those who persist, there is a certain beauty in the precision. The diagrams and the careful, methodical descriptions leave the reader with a sense of the vast, hidden complexity of the natural world that persists in the forests and rocky outcrops of the Midwest, untouched by the passage of time.