Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
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Cyclostoma dicksoniae (Sherwood) P.R. Johnst. in Johnston & Park, FUSE 14 158 (2024)
Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
Biostatus
Nomenclature
(Sherwood) P.R. Johnst.
Sherwood
P.R. Johnst.
2024
158
ICN
species
Cyclostoma dicksoniae
Classification
Associations
has host
has host
isolated from
has host
Descriptions
Additional specimens examined: 9 collections were examined in addition to the holotype. All were from New Zealand, and included: AUCKLAND: Waitakere Ra., Sharps Bush, on Dracophyllum latifolium A. Cunn., P. R. Johnston, G. J. Samuels, 3 Mar 1980 (PDD 41892); Waitakere Ra., Karamatura Stream, on Cyathea medullaris, P. R. Johnston, E. Horak, B. Segedin, 24 Jun 1981 (PDD 41896). WAIKATO: Ngaruawahia, Hakarimata Reserve, on unidentified herbaceous host, P. R. Johnston, G. J. Samuels, J. M. Dingley, 28 Jan 1981 (PDD 41898).
Ascocarps deeply immersed, urceolate, round, 0.4-0.8 mm diam., semi-erumpent, crystalline margin entire, greyish; surrounded by subiculum comprising fine, orange-brown coloured hyphae. Margin in cross-section 60-100 µm wide. Crystals forming a 40-75 µm wide layer at top of margin. Wall layer 5-10 µm wide, extending from top of margin and under subhymenium, comprising pale brown, thin walled, 1.5-3 µm diam. hyphae. Wall surrounded by 20-50 µm wide stromatic layer, comprising dark brown, thick walled, irregularly oriented hyphae. Periphyses 30-60 x 2-2.5 µm, branching. Subhymenium faintly amyloid. Paraphyses not differentiated at tips, 1.5-2 µm diam., nonamyloid. Asci 420-520 x 5-7 µm, cap 5-7.5 µm thick, 8-spored. Spores 350-600(-800) x 1.5-2.5 µm, cells 4-6 µm long, sometimes showing an indistinct, gelatinous sheath.
Anamorph in vivo: Pycnidia globose, 60-100 µm diam., immersed, appearing to open by an irregular split in wall layer. Walls 25-30 µm thick, com rising dark brown, thin-walled, tangled hyphae, forming a more or less pseudoparenchymatous tissue. Conidiogenous cells arising from inner wall layers, cylindric, 4-10 x 1.5-2 µm, hyaline, phialidic, solitary or rarely on short, unbranching conidiophores, apertures apical, or lateral and immediately below transverse septa. Conidia acropleurogenous, cylindric, 5.5-10 x 0.8-1 µm, ends rounded, nonseptate, hyaline.
Characteristics in culture: Ascospores germinating on agar plates within 24 h, forming colonies on OA 3-4 cm diam. after 8 weeks. Aerial mycelium dense, cottony, white. Pycnidia globose, 150-280 µm diam., separate, scattered over agar surface, dark walled, opening by an irregular split in wall. Walls 30-50 µm thick, comprising partly gelatinised, tangled, 1.5-3 µm diam. hyphae. Inner few layers of cells hyaline, outer layers with dark brown walls, although they are often paler in lower half of pycnidium. Conidiogenous layer is the same as that found in vivo, but the conidiogenous cells are more often held on the short, unbranching conidiophores.
Anamorph in vivo: Pycnidia globose, 60-100 µm diam., immersed, appearing to open by an irregular split in wall layer. Walls 25-30 µm thick, com rising dark brown, thin-walled, tangled hyphae, forming a more or less pseudoparenchymatous tissue. Conidiogenous cells arising from inner wall layers, cylindric, 4-10 x 1.5-2 µm, hyaline, phialidic, solitary or rarely on short, unbranching conidiophores, apertures apical, or lateral and immediately below transverse septa. Conidia acropleurogenous, cylindric, 5.5-10 x 0.8-1 µm, ends rounded, nonseptate, hyaline.
Characteristics in culture: Ascospores germinating on agar plates within 24 h, forming colonies on OA 3-4 cm diam. after 8 weeks. Aerial mycelium dense, cottony, white. Pycnidia globose, 150-280 µm diam., separate, scattered over agar surface, dark walled, opening by an irregular split in wall. Walls 30-50 µm thick, comprising partly gelatinised, tangled, 1.5-3 µm diam. hyphae. Inner few layers of cells hyaline, outer layers with dark brown walls, although they are often paler in lower half of pycnidium. Conidiogenous layer is the same as that found in vivo, but the conidiogenous cells are more often held on the short, unbranching conidiophores.
Habitat: Common on the dead leaves of plants with large, tough, strap-like leaves. Also found rarely on Cyathea medullaris.
Ascocarpi immersi, profunde cupulati, 0.4-0.8 mm diam., margine integro, griseo, in sectione transversali 60-100 µm crasso. Stratum crystallinum 40-75 µm crassum. Stratum parietis et stroma 30-60 µm crassa, hypharis 1.5-3 µm diam., brunneis. Periphysoidea 30-60 x 2-2.5 µm, non ramosa. Subhymenium in iodo caerulescentes. Paraphyses filiformes, simplices, in iodo caerulescentes. Asci 420-520 x 5-7 µm, apice 5-7.5 µm crassi, 8-spori. Sporae 350-600(-800) x 1.5-2.5 µm, cellulis 4-6 µm longis. Status conidialis: Coleophoma-similis.
Holotypus: PDD 41899 ex Freycinetia baueriana Endlicher ssp. banksii (A. Cunn.) B. C. Stone.
Holotypus: PDD 41899 ex Freycinetia baueriana Endlicher ssp. banksii (A. Cunn.) B. C. Stone.
Notes: See notes under S. asteliae.
Etymology: subiculata; refers to fine subiculum surrouding ascocarp.
Etymology: subiculata; refers to fine subiculum surrouding ascocarp.
Holotype: New Zealand: AUCKLAND: Waitakere Ra., Cascades Track, on Freycinetia baueriana ssp. banksii, P. R. Johnston, G. J. Samuels, 9 Mar 1981 (PDD 41899).
Apothecia at first immersed, opening by a pore, not becoming erumpent, 0.2-0.5 mm diam., somewhat elongate in outline, with a narrow, entire to stellate, whitish-grey border and very deeply urceolate brown disc. Margin,in cross section 40 µm thick at the broadest point, nearly obsolete below, the wall consisting of 4-5 layers of interwoven brown hyphae 1.5 µm diam., the crystalline layer moderately prominent, the periphysoids 5 x l5 µm, unbranched, sparse. Subhymenium 5-10 µm thick, J-, of small angular cells resting on a continuation of the brown wall. Paraphyses numerous, filiform, 1.0 µm thick below, enlarged to 1.5-2.0 µm above, faintly brown, J-. Asci 400-475 x 5-6 µm, the cap 6-7 µm thick, pierced by a narrow pore. Ascospores nearly as long as the asci, strictly filiform, 2.0 µm broad, septate, the cells 2.5-4 µm long.
Ascocarpi primum immersi, profunde cupulati, 0.2-0.5 mm diam., margine integro vel lacerato, albo, disco brunneo. Margo in sectione transversali 40 µm crassus, siccus ab hymenio se abrumpens, hypharum pariete 1.5 µm diam., brunneo. Stratum crystallinum 30 µm crassum. Periphysoidea 5 x 1.5 µm, non ramosa. Paraphyses filiformes, simplices, 475 x 1.0 µm, pallide brunneae, in iodo non caerulescentes. Asci 400-475 x 5-6 µm, apice 6-7 µm crassi, 8-spori. Sporae 375-450 x 2.0 µm, cellulis 2.5-4 µm longis.
On a fern stalk, New Zealand.
This species is distinctive because it is taller than broad and seems transitional to Robergea. It differs from R. canariense in having a strictly vertical orientation, opening by a pore, and having brown paraphyses and more closely-septate spores.
PDD 32648, on stipes of Dicksonia squarrosa near track, Horseshoe Bay, Stewart Island, New Zealand, J. M. Dingley, 17 Feb. 1954.
Taxonomic concepts
Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
Stictis dicksoniae Sherwood
Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
Stictis dicksoniae Sherwood (1977)
Stictis subiculata P.R. Johnst.
Cyclostoma dicksoniae (Sherwood) P.R. Johnst. 2024
Stictis subiculata P.R. Johnst. (1983)
Stictis subiculata P.R. Johnst. (1983)
Stictis subiculata P.R. Johnst. (1983)
Stictis subiculata P.R. Johnst. (1983)
Stictis subiculata P.R. Johnst. 1983
Collections
Identification keys
Metadata
f6c4d82d-4744-480d-b89f-d57a43aacf70
scientific name
Names_Fungi
23 May 2024