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Go to the NZFungi website for more indepth information on Helicogermslita aucklandica. Helicogermslita aucklandica

Synonyms

Rosellinia aucklandica

Biostatus

Present in region - Indigenous. Endemic

Images (click to enlarge)

 

Caption: Fig. 2 A-C, Astrocystis cyatheae, PDD 49673: A, Ascospores, the lowest immature (1st, 2nd from type, PDD 49672); B, Ascus apical ring; C, Conidiophores and conidia on the stroma (PDD 42074); D, H. aucklandi
Caption: Fig. 3 Helicogermslita aucklandica. A-F, Stromata; G, Ascospores. K 79240. Scale bars: A-E = 0.5 mm; F = 0.25 mm; G = 10 µm.
 

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: Stromata 475-575 µm high, 550-675 µm wide (n = 10), erumpent through wood, when young covered by host epidermis, semiglobose to conical, black, solitary, crowded or 3 to 4 fused into small groups. Ostioles finely papillate. Ectostroma 50 µm thick, black. Entostroma not seen. Perithecia detached. Ascus apical rings not seen. Ascospores (19)20.7 ± 1.2(23.5) long, (10)12 ± 1(14) µm wide (n = 21), broadly ellipsoidal, dark brown, with sigmoid germ slit. Anamorph not known.
Notes: NOTES: The original specimen from New Zealand collected by H. Krone was not located in any of the major herbaria or in those which may host some of Rabenhorst's exsiccata. One specimen in S, labelled as Rosellinia aucklandica from the Philippines, turned out to be R. merrillii Syd. The original description of R. aucklandica (Rabenhorst 1878) gives no stroma size, but the ascospores are described as 22 µm long and 10-12 µm wide. After extensive study of New Zealand material and additional type specimens of Rosellinia spp., the only specimen with ascospores matching the size of those of R. aucklandica is the one from the Kew herbarium previously classified as R. mammoidea. The specimen consists of two pieces, one in an envelope and one glued on a sheet, both containing stromata erumpent from heavily decomposed wood. The ascospores are not in excellent condition, but the sigmoid germ slit is still clearly visible.