Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Saccardoëlla |
lacustris |
Fallah & Shearer Mycologia 93(3): 572. 2001. |
| Class |
Order |
Family |
| Sordariomycetes |
Inc. sed. |
Inc. sed. |
|
| Synonymy: |
|
Description
|
| Habit: |
Ascomata on wood scattered, superficial with base partially immersed. |
|
| Ascomata: |
Ascomata 280–400 x 242–265 µm, scattered, superficial with base partially immersed, globose to pyriform, upright or horizontal, brown. |
|
| Peridium: |
Peridium 15.6–19.5 µm thick, composed of 3 or 4 layers of pseudoparenchymatic cells; cells (4-) 6–12 x 2–10 µm, of textura angularis, elongate fusiform, compressed. |
|
| Beak: |
Beak 190–203 x 75–89 µm, centric or eccentric, tomentose, periphysate, hyaline to light brown, cylindrical. |
|
| Hamathecium: |
Hamathecium of paraphyses 2–3.5 µm wide, slightly broader at the base, constricted at septa. |
|
| Ascus: |
Asci 125–140 x 10–18 µm, cylindrical, with truncate apex, J-, with a small refractive apical apparatus, with 8 overlapping biseriate ascospores. |
|
| Ascospore: |
Ascospores 44–50 x 4–8 µm, narrowly fusiform with acute ends, straight or curved and at times sigmoidal, hyaline becoming pale yellow at maturity when in mass, guttulate, 5–7 (-8) septate, not constricted at septa, with small inconspicuous bipolar gelatinous caps that stain with aqueous cotton blue. |
|
| Sheath: |
Not observed. |
|
| Appendage: |
Appendages bipolar, gelatinous staining in aqueous cotton blue. |
|
| Culture: |
|
| Anamorph: |
Not observed. |
|
Other info
|
| Type & Location: |
HOLOTYPE: USA. WISCONSIN: Vilas Co., Trout Lake, UTM Zone 16, 293196mE, 5098921mN, 46°00.838ÕN, 89°40.283ÕW, on submerged partially, decomposed branches, 27 June 1995, PMF P1-18 (ILLS 54026). |
| Other Specimens: |
|
| Substratum: |
Submerged woody debris. |
| Habitat: |
Lentic |
| Distribution: |
USA (WI) |
| Pertinent Literature: |
Fallah & Shearer 2001. |
| Comments: |
The ascospore size of S. lacustris falls within the range of those of S. transsylvatica (Rehm) Berl. The ascospores in the latter species are broadly fusiform, 11-18 septate, and constricted at the middle septum. Saccardoella lacustris possesses ascospores that are narrowly fusiform, 5 to 7 septate, and provided with small inconspicuous apical gelatinous caps that are visible when stained with aqueous cotton blue. |
Additional Pictures
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Fig. 1, bar = 50 µm,; Figs. 2 & 3, bar = 25; Fig. 4 bar = 50 µm; Figs. 5 & 6, bar = 25 µm.
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