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Published In: The Bryologist 98: 372. 1995. (Bryologist) Name publication detail

Project Name Data (Last Modified On 2/15/2011)
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Hyophiladelphus is a monotypic genus recently segregated (Zander 1995) from Barbula. Previously Steere (1938), noting the only species in Hyophiladelphus combined the costal structure of Barbula with the leaf shape of Tortula, suggested it was “sufficiently distinct from both genera” to justify recognition at the generic level. The genus has broad, elliptic to spathulate leaves that are somewhat inrolled when dry, and leaf cells bulging-mammillose on the ventral surface but plane on the dorsal surface. Other distinctive features of Hyophiladelphus include its common occurrence in sunny, dry habitats and rosulate, nearly stemless habit. Zander (1995) placed Hyophiladelphus in the tribe Hyophileae.

Regionally, Hyophiladelphus resembles a group of genera (Hyophila, Plaubelia, Weisiopsis, and Luisierella) with similar leaf shapes and leaf cells bulging-mammillose on the  ventral surface. Hyophila is usually a larger plant than Hyophiladelphus with distinct stems,  leaves when dry that are stiffly incurved with involute margins, and eperistomate capsules. Plaubelia differs from Hyophiladelphus in its longer stems, usually single (dorsal) costal stereids, enlarged, bulging cells on the upper ventral surface of the costa, and short, non-twisted peristome teeth. Weisiopsis and Luisierella differ from Hyophiladelphus in having a costa with a single (dorsal) stereid band, abruptly enlarged and thin-walled basal leaf cells, and either rudimentary or short, erect, non-twisted peristome teeth.


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Hyophiladelphus (C. Müll.) Zand., Bryologist 98: 372. 1995.

Barbula sect. Hyophiladelphus C. Müll., Syn. Musc. Frond. 1: 604. 1849. Barbula subg. Hyophiladelphus (C. Müll.) Zand., Phytologia 44: 201. 1979. Tortula sect. Hyophiladelphus (C. Müll.) Broth., Nat. Pflanzenfam. 1(3): 429. 1902.

Barbula sect. Agrariae Steere in Grout, Moss Fl. N. Amer. 1(3): 173. 1938. 

Plants small, gregarious to tufted. Stems very short, not branched, hyalodermis weakly present, central strand well-developed; rhizoids clustered at base of stem. Axillary hairs with all cells hyaline. Leaves oblong, elliptic, or oblong-spathulate, rosulate, erect-incurved when dry, erect-spreading to spreading when wet; apices broadly acute, often mucronate; margins entire to faintly serrulate at apex, erect when wet, inrolled when dry; costa stoutly short-excurrent to percurrent, ventral surface cells elongate, guide cells and two stereid bands present, ventral and dorsal surface layers somewhat enlarged; upper cells short-rectangular, quadrate or oblong-rhombic, firm-walled, bulging-mammillose on ventral surface, plane on dorsal surface, basal cells short- or long-rectangular, oblong, triangular, thin-walled, smooth, alar cells enlarged, bulging. Dioicous. Perichaetia and perigonia terminal. Setae elongate, smooth. Capsules cylindrical, erect, smooth; exothecial cells rectangular, thin-walled; stomata in neck; opercula erect, long-rostrate; annuli of 1–2 rows of vesiculose cells, revoluble; peristome well-developed, teeth spirally twisted, basal membrane high. Spores smooth or lightly papillose. Calyptrae cucullate, smooth.

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