Tubeufiales » Tubeufiaceae » Boerlagiomyces

Boerlagiomyces websteri

Boerlagiomyces websteri Shearer & J.L. Crane

IndexFungorum number: IF 434485

Etymology. Named in honor of the renown British mycologist, John Webster, for his outstanding contributions in research and teaching to mycology.

Holotype: ILLS 51611


Sexual morph: Colonies on yeast extract soluble starch agar with balsa wood grown at 24oC mostly immersed, dark brown, aerial hyphae greyish white; anamorph lacking. Subiculum lacking on natural substrate or when grown in culture on alfalfa stems. Ascomata 220–423 × 200–218 µm, scattered, superficial, obpyriform to ampuliform, rostrate, membranous, brown, setose. Beak (50–)70–140 × 70–120 µm, central, membranous, rounded at apex, wall undifferentiated anatomically from ascomal venter, setose, ostiolate, periphysate. Periphyses simple, septate, terminal cells rounded. Peridium two-layered, of textura angularis in surface view, 55–85 µm thick; inner layer 9–10 µm wide consisting of three to four layers of hyaline, compressed, fusiform cells; outer layer 46–75 µm wide, with three to four cell layers of textura angularis. Setae (50–)55–175(–233) µm long, 3.3–5.5 µm wide at base, tapering gradually to 2.2–3.3 µm wide at apex, lanceolate, stiff, dark brown, one to two-septate, scattered over ascoma but concentrated around beak, originating from surface cells of ascomal wall. Pseudoparaphyses 2.2–4.4 µm wide, cellular, simple or branched, constricted at septa; chains of clavate, thin-walled, hyaline cells lining ascomal venter and surrounding the central fascicle of asci. Asci 164–214(–278) × 20–43 µm, few, fissitunicate, two-spored, fasciculate, cylindric-clavate, rounded at apex, tapering at base to a short stalk, basal, ascus apex slightly thickened and rigid and shed as a cap during ectoascus dehiscence. In dried specimens, endoascus is retracted from ectoascus except at the ascus apex resulting in a dome shaped structure at the apex ofthe endoascus. Ascospores 66–92(–107) × 26–35 µm, forcibly discharged from asci and ascomata, oblong, broadly rounded at ends, at first hyaline becoming uniformly golden brown to brown, dictyosporous with nine transverse septa formed early in development and one to three vertical septa within each cell layer, surrounded by a gelatinous sheath. Ascospore sheath very broad at early stages of ascospore development, becoming thinner as ascospores mature, and, finally, difficult to detect at ascospore maturity. Ascospores connected by cytoplasmic strands throughout development and after release from ascus. Asexual morph: Undetermined. (Description from Shearer and Crane 1995)


Material examined: USA, Illinois, Johnson Co., Cache River at foot bridge to Heron Pond, UTM Zone 16, 330390mE, 4135430mN, a dried culture isolated from muddy, submerged, decorticated wood, 3 Oct. 1992, CA. Shearer and J.L. Crane, A-59-1 (ILLS 51611; ISOTYPES, NY, DAOM; culture, ATCC 96580).


Photographic plate: see Shearer and Crane (1995)


Freshwater distribution: USA (Shearer and Crane 1995)



Shearer CA, Crane JL (1995) Boerlagiomyces websteri, a new ascomycete from fresh water. Mycologia 87:876–879.


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