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 Rosellinia gisbornia
BiostatusPresent in region - Indigenous. Endemic
Images (click to enlarge)
Caption: Fig. 15 Rosellinia gisbornia. A, C-G, Stromata, A, E, showing subiculum (arrows); B,
Vertical section of stroma, outer shell stroma, inner shell perithecium; H, | 
Caption: Fig. 8 A-D, Rosellinia arcuata, PDD 41969: A, Ascospores; B, Ascus apical ring; C,
Conidiophores and conidia on the host; D, Conidiophores and conidia on OA; E-G, R.
freycinetiae, PDD 20580: E, Ascus a |
Article: Petrini, L.E. (2003). Rosellinia and related genera in New Zealand. New Zealand Journal of Botany 41(1): 71-138 (http://www.rsnz.org/publish/abstracts.php).
Description: Subiculum evanescent, of restricted extension, cream to light brown, gradually disappearing,
absent in mature material. Stromata (550)690 ± 100(850) µm high, (600)738 ± 84(825) µm
wide (n = 15), semiglobose, cupulate to conical, black, lower part slightly rugose, solitary or
densely crowded in small groups, when young completely covered by the subiculum,
becoming exposed when growing and subiculum gradually worn away. Ostioles finely
papillate or not pronounced. Ectostroma 50-75 µm, black, brittle. Entostroma dark brown,
absent in old material. Perithecia detached and collapsed in mature material. Ascus apical
rings (4.8)6.2 ± 1.4(8.6) µm high, upper width 2.8-4.8 µm, lower width 2.8- 3.8 µm (n = 13),
J+, blue to pale blue. Ascospores (21.2)25.5 ± 2.3(31.7) µm long, (6.7)7.7 ± 0.5(8.6) µm wide
(n = 90), inequilaterally ellipsoidal, brown to dark brown, with straight germ slit running over
the whole spore length on flat side, ending shortly before ends, both extremities and flat side
surrounded by a slimy sheath, 2-3 µm thick at ends, 1-2 mm thick at side.
Culture on OA white to cream with brown patches in the centre, felty to velutinous, reverse
cream, sterile. On PDA hyaline to white, centre brown, felty, appressed, reverse centre brown,
light brown towards margin, sterile.
ANAMORPH: Unknown.
Habitat: HOSTS: Undetermined.
MATRIX: On bark or wood of twigs, c. 1.5 cm diam.
Notes: ETYMOLOGY: Referring to Gisborne Province, where the type specimen was collected.
NOTES: Rosellinia gisbornia is characterised by an evanescent, cream to light brown
subiculum and ascospores with slimy caps and sheath on one side. The germ slit runs straight
over the whole spore length. The ascospores present in the specimen PDD 45917 are up to 4
µm longer than those seen in the other two collections.
Rosellinia gisbornia differs from R. chusqueae and R. dingleyae by having ascospores with
straight germ slit and asci with smaller apical rings. It can be distinguished from the
morphologically similar R. britannica by the stromatal shape and size, and the characters of
the subiculum (Petrini 1993). Rosellinia hyalospora Theiss. has ascospores with a similar
size, but they are light brown and lack the slimy sheath. Its stromata are also smaller (L. E.
Petrini unpubl. data).
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