Freshwater Ascomycetes - Species Monograph

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Genus	Species	Author
Lockerbia	striata	Raja & Shearer
Class	Order	Family
Sordariomycetes	Inc. sed.	Inc. sed.

MycoBank ID: 507450

Synonymy:

Description

Habit:

Ascomata on wood, large, black, superficial, scattered.

Ascomata:

Ascomata ca. 500–620 × 400–480 µm, scattered, globose to subglobose, tapering to a stalk at the base, superficial with base immersed in the substrate, cleistothecial, dark brown to black, membranous, rupturing and wearing away at maturity.

Peridium:

Peridium ca. 15–20 µm wide, areolate in surface view, in medial longitudinal section composed of two layers, an outer dark brown amorphous region and an inner hyaline region of short angular cells.

Beak:

Absent.

Hamathecium:

Paraphyses abundant, simple or branched, narrow, ca. 2 µm wide, filiform, septate, hyaline, immersed in gel matrix. Asci 140–170 × 20–24 µm, unitunicate, cylindrical, with a narrow short pedicel, with eight uniseriate ascospores.

Ascus:

Asci 140–170 × 20–24 µm, unitunicate, cylindrical, with a narrow short pedicel, with eight uniseriate ascospores.

Ascospore:

Ascospores 20–24 × 14–18 µm, 1-celled, subglobose, obovate or oval, hyaline when young, becoming dark brown with age, without germ pores or slits, ascospore wall thinner at apices, warted, surrounded by a hyaline, firm gelatinous sheath ca. 3–5 µm wide; outer less firm sheath surrounds the inner sheath. radiating from ascospore wall.

Sheath:

Inner sheath not staining in aqueous nigrosin or India ink; sheath striated, radiating from ascospore wall. Inner sheath surrounded by an outer less firm gelatinous sheath not staining with aqueous nigrosin or India ink.

Appendage:

None observed.

Culture:

Unable to obtain cultures.

Anamorph:

None observed.

Other info

Type & Location:

USA. FLORIDA: Blackwater River State Forest, Horns Creek Swamp, 30°46'31"N, 86°54'43"W, water 30 C, pH 6, on submerged partially decorticated woody debris, 10 Jul 2004, HAR and CB, F24-1 (ILL40118).

Other Specimens:

USA. FLORIDA: Apalachicola National Forest, Andrew Lake near Silver Lake Recreation Area, 30°24'09"N, 84°24'27"W, water 33 C, pH 6.5, on submerged herbaceous debris, 13 Jul 2004, HAR and CB, F24-2. MISSISSIPPI: Big Black River at Mississippi 19, east of West, Holmes County, 33°11'38"N, 89°46'14"W, water 7C, pH 5.5, on submerged decorticated woody debris, 27 Dec 1993, JLC and CAS, A247-1; Edge of Wolf River at I-10 in Harrison County, 30°21'25"N, 89°17'12"W, water 24 C, pH 6.5, on submerged decorticated woody debris, 16 Jun 1997, KR, A247-2.

Substratum:

Submerged woody debris.

Habitat:

Lentic and lotic.

Distribution:

USA (FL, MS).

Pertinent Literature:

Raja, H. and C. A. Shearer. 2008.

Comments:

In the original description of this species, the presence of an outer, secondary ascospore sheath was omitted. This sheath is illustrated in "Additional Pictures" below

Additional Pictures

Immature ascus.
Surface of ascoma.
Warts on ascospores.
Immature ascus.
Young developing ascus and paraphyses.
Ascospore immersed in gel.
Asci.
Outer, secondary ascospore sheath and inner ascospore sheath.
Condensed gelatinous material surrounding ascospores.
Ascospore wall roughening.
Germinating ascospore.

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