Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Chaetomastia |
typhicola |
(Karsten) Barr |
| Class |
Order |
Family |
| Dothideomycetes |
|
Dacampiaceae |
|
| Synonymy: |
Basionym = Leptosphaeria typhicola (Karsten) Hedjaroude, Sydowia 22: 86. 1968.
Basionym = Massariosphaeria typhicola (Karsten) Leuchtmann, Sydowia 37: 168. 1984.
= Leptosphaeria occidentalis Ellis &Everh. Erythea 2: 20. 1894.
= Leptosphaeria baldingerae Fautrey & Lambotte, Rev. Mycol. (Toulouse) 19: 3. 1897
Basionym = Phaeosphaeria baldingerae (Fautrey & Lambotte) Hedjaroude, Sydowia 22: 87. 1968. |
Description
|
| Habit: |
Ascomata immersed on substrate, scattered or gregarious. |
|
| Ascomata: |
Ascomata (195-) 203–267 x 199–222 µm, immersed, scattered or at times gregarious, ovoid or ellipsoid, papillate. |
|
| Peridium: |
Peridium 17.5–29.5 µm wide, covered with tomentum of interwoven hyphae, with 4 to 8 layers of small pseudoparenchymatic cells; cells 8–14 x 3–6 µm, of textura angularis in surface view and in median longitudinal section. |
|
| Beak: |
Papillae 35–70 x 58.5–93.5 µm, dome-shaped, thicker at the apex. |
|
| Hamathecium: |
Hamathecium of cellular pseudoparaphyses 2–3.5 µm wide. |
|
| Ascus: |
Asci (93-) 113–133 x 11.5–18 µm, clavate, fissitunicate, with small apical chamber, tapering to a short hoof-shaped stalk, with 8 overlapping ascospores. |
|
| Ascospore: |
Ascospores 32–36 x 6–8 µm, fusiform, yellowish brown, becoming dark brown, asymmetric, slightly curved or straight, 5–7 (-10) septate, with third or fourth cell enlarged, constricted at the enlarged cells and less constricted at the narrow cells, verruculose, provided with a gelatinous sheath that stains with India ink, 6–10 µm in diam. |
|
| Sheath: |
Gelatinous sheath surrounding ascospores; sheath stains with India ink and is 6–10 µm wide. |
|
| Appendage: |
Not observed. |
|
| Culture: |
|
| Anamorph: |
Not observed. Aposphaeria- like conidiomata have been reported for this species (Lucas and Webster 1967). |
|
Other info
|
| Type & Location: |
|
| Other Specimens: |
USA. WISCONSIN: Vilas Co., Allequash Lake, UTM Zone 16, 296454mE, 5101163mN, 46°2.032ÕN, 89°37.825ÕW, on submerged, partially decomposed stems of Typha latifolia, 17 June 1996, PMF & JLC P4-21 (ILLS 54029); 26 Sept. 1997, PMF & JLC P4-63 (ILLS 54027); Sparkling Lake, UTM Zone 16, 291184mE, 5099214mN, on submerged, partially decomposed stems of T. latifolia, 27 June 1995, PMF & JLC P2-32; 28 May 1996, PMF & JLC P2-65 (ILLS 54028); Crystal Lake, UTM Zone 16, 297618mE, 5097887mN, 46°00.280N, 89°36.835'W, on submerged, partially decomposed grass stem, 28 May 1996, PMF & JLC P7-7-y (ILLS 54030). |
| Substratum: |
Typha latifolia |
| Habitat: |
Lentic |
| Distribution: |
North America (Wisconsin), Europe |
| Pertinent Literature: |
Fallah 1999. |
| Comments: |
Barr (1989b) reinstated Chaetomastia (Sacc.) Berlese for several species placed in Massariosphaeria (Müller) Crivelli, based on characters such as: ovoid or obpyriform ascomata with a wide papilla; peridium relatively wide, comprised of small pseudoparenchymatic cells; and dark, asymmetric, phragmosporous ascospores that are typical of the family Dacampiaceae Körber (Barr 1987). The fungus collected from LTER lakes is morphologically similar in all respects to C. typhicola. Leuchtmann (1984) noted a range of variation in spore size for C. typhicola. The collections from different Wisconsin LTER lakes did not show much variation in spore size; a similar observation was made by Barr (1989b) who examined North American specimens. |
Additional Pictures
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First 2 pictures, bar = 50 µm; remaining pictures, bar = 25 µm.
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