Cucurbitaria laburni

(Pers.: Fr.) de Not.


HYPOSTROMA very well developed, subiculate or pseudoparenchymatous, composed of fungal tissue only or fungal tissue mixed with host tissue, produced in dead branches.


PSEUDOTHECIA (p) gregarious in large, 2-15 mm wide, groups of five or more, erumpent, mostly turbinate, collapsing at the top to become flat, with a very elongated base, up to 950 µm wide, and a circular to ellipsoidal, black, ca. 0.5 mm diam, ostiolum.

Wall (w) roughened, composed of dark brown, angular to globose cells.


ASCI (a) usually short stalked, rarely long stalked, cylindrical, 160-190 x 11-16 µm, with 8 ascospores.


ASCOSPORES (as) uniseriate, clavate, yellow brown to brown, 8-septate, with 1-2 vertical septa, constricted at the septa, 22-32(-40) x 9-11 µm.

 


HOST PLANT AND DISTRIBUTION. The host of the specimens of C. laburni presented here was Laburnum anagyroides Medik. (Madej 1974). Other plants hosting this fungus are species of the genus Cytisus (Sivanesan 1984).

Camarosporium laburni has a world-wide distribution (Sivanesan 1984).


NOTES. The anamorph of C. laburni is Camarosporium laburni Sacc. et Roum.

Cucurbitaria laburni is a saprotrophic fungus occupying dead branches of the genera Cytisus and Laburnum (Sivanesan 1984).

The specimens of C. laburni presented here were collected by T. Madej in 1976. Although the ascospores retained and remained in the original places and positions, their bitunicate asci completely deteriorated and, thereby, are invisible.


REFERENCES

Madej T. 1974. Materialy do mikoflory roslin woj. szczecinskiego. Rozprawy nr 35. Akad. Roln. Szczecin.

Sivanesan A. 1984. The bitunicate ascomycetes and their anamorphs. J. Cramer. Fl-9490 Vaduz.