Claviceps queenslandica Langdon

Synonym

Claviceps paspali Steven & Hall var. queenslandica (Langdon) Tanda

Description

Sclerotia formed in the fertile florets of spikelets and replacing the ovaries, subglobose, up to 3 mm wide, pale yellow, minutely papillate, matt surface.

Conidia of one type

  • macroconidia formed on narrow, flask-shaped terminal conidiogenous cells on the sphacelium and later immersed in honeydew, oblong-subwedge shaped, 10-20 x 3-5 µm, hyaline, aseptate.

Ascostromata consisting of a globose capitulum, 0.75-1.5 mm in diameter, yellow, borne by a slender stipe about 3 mm long, yellow.

Perithecia 220-260 x 120-150 µm.

Asci 80-170 x 5 µm.

Ascospores 70-130 µm.

Hosts
   
Host family: Poaceae
   
Host species: Paspalum scrobiculatum

Distribution

NSW, QLD

Comments

Langdon (1954) differentiated this species from C. paspali by its longer and narrower conidia, by the pale yellow and matt surface of its sclerotia (those of C. paspali are wrinkled and fissured), and by differences in the dimensions of the perithecia and ascospores. He reported that P. scrobiculatum could also be infected by C. paspali, but that Paspalum dilatatum was not a host of C. queenslandica. The paucity of information on the morphology of the sexual state as provided in the original description could not be improved due the unavailability of herbarium specimens with the appropriate structures. The record of Cerebella paspali sic in Cooke’s Handbook of Australian Fungi published in 1892 suggests that either C. paspali or C. queenslandica (both found only on Paspalum species) was present in Australia at that time. In his study of Claviceps taxa on Paspalum species in Japan, Tanda (1992) reduced queenslandica to a variety of C. paspali, but there are inconsistencies in his assumptions and observations which raise questions about the validity of his assertions.

Highslide JS
Claviceps queenslandica on Paspalum scrobiculatum - BRIP 8101.
Scale bar = 1 mm.
Highslide JS
Claviceps queenslandica on Paspalum scrobiculatum - BRIP 8101.
Scale bar = 500 µm.
Highslide JS
Claviceps queenslandica on Paspalum scrobiculatum - BRIP 8101.
Scale bar = 20 µm.
Highslide JS
Claviceps queenslandica on Paspalum scrobiculatum.
Scale bar = 20 µm.