| name | Amanita karea |
| name status | nomen acceptum |
| author | G. S. Ridl. |
| english name | "Stone-in-the-Water Amanita" |
| images | |
| intro |
The following description is based on Ridley (1991). |
| cap |
The cap of Amanita karea is 20 - 60 mm wide, convex to plano-convex, eventually depressed in the center, grayish to fawn to grayish sepia to buff or honey to buff, viscid when young or wet, with a nonappendiculate margin that sometimes splits, with the cap skin "rolling back to give a ragged appearance." The volval remnants are flat, squarish warts reducing in size to fibrillose crumbs at the cap margin; the warts are rarely pointed, dark grayish sepia to mouse-gray and are arranged concentrically like ripples ("kare" in Maori). The flesh is white or pale grayish-sepia to mouse gray in center under cap skin. |
| gills |
Gills are crowded, free, 3 - 6 mm wide, white; the short gills are subtruncate. |
| stem |
Its stem is 38 - 70 × 5 - 8 mm, solid or tending to hollow, white to pale smoke-gray, sparsely floccose, or breaking into transverse, striate bands above the ring, white to smoke-gray or pale grayish sepia, smooth to finely scaled below the ring. The basal bulb is marginate to marginate-depressed and rounded below, 7 - 21 mm wide. Volva forms a band or rim of dark grayish sepia to fuscous remnants around the stem base. The ring is membranous, finely striate, white to sordid white at margin. The flesh is white streaked with gray. |
| spores |
The spores measure 6.5 - 9 × 5.5 - 6.5 (-8) µm and are occasionally broadly ellipsoid to ellipsoid, occasionally globose or subglobose and amyloid. Clamps are absent at bases of basidia. |
| discussion |
Originally described from both North and South Islands of New Zealand in association with Southern Beech (Nothofagus), Leptospermum, and Kunzea. Ridley states that in the past many specimens of A. karea were misidentified as A. nothofagi G. Stev.—R. E. Tulloss |
| brief editors | RET |
| name | Amanita karea | ||||||||||||||||||||
| author | G. S. Ridl.. 1991. Austral. Syst. Bot. 4: 340, fig. 7(a-m). | ||||||||||||||||||||
| name status | nomen acceptum | ||||||||||||||||||||
| english name | "Stone-in-the-Water Amanita" | ||||||||||||||||||||
| synonyms |
=Amanita excelsa sensu Stevenson (1962) p.p. The editors of this site owe a great debt to Dr. Cornelis Bas whose famous cigar box files of Amanita nomenclatural information gathered over three or more decades were made available to RET for computerization and make up the lion's share of the nomenclatural information presented on this site. | ||||||||||||||||||||
| etymology | karea (Maori), "ripple"; referring to the concentric or ripple-like arrangement of volva remnants on the pileus | ||||||||||||||||||||
| MycoBank nos. | 355195 | ||||||||||||||||||||
| GenBank nos. |
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| holotypes | PDD | ||||||||||||||||||||
| intro |
The following text may make multiple use of each data field. The field may contain magenta text presenting data from a type study and/or revision of other original material cited in the protolog of the present taxon. Macroscopic descriptions in magenta are a combination of data from the protolog and additional observations made on the exiccata during revision of the cited original material. The same field may also contain black text, which is data from a revision of the present taxon (including non-type material and/or material not cited in the protolog). Paragraphs of black text will be labeled if further subdivision of this text is appropriate. Olive text indicates a specimen that has not been thoroughly examined (for example, for microscopic details) and marks other places in the text where data is missing or uncertain. The following is based entirely on the protolog of the present species. Basidiomes very small to medium. | ||||||||||||||||||||
| pileus | 20 - 60 mm, grayish to fawn, mouse-gray to grayish sepia, or honey to buff, viscid when young or wet, drying with age, at first convex to plano-convex, then plano-depressed; context predominantly white, sometimes pale grayish sepia to mouse-gray under pileipellis in disc, rarely with gray line above lamellae; margin nonappendiculate, entire or occasionally splitting, with pileipellis rolling back and giving ragged appearance; universal veil as predominantly flat (rarely pointed), warts with squarish bases, ranging to fibrillose crumbs at pileus margin, dark grayish sepia to mouse-gray, occasionally paler at the tips, arranged concentrically. | ||||||||||||||||||||
| lamellae | free, crowded, white, 3 - 6 mm broad; lamellulae subtruncate. | ||||||||||||||||||||
| stipe | 38 - 70 × 5 - 8 mm, surface above partial veil white to pale smoke-gray, sparsely floccose, or breaking into transverse, striate bands, below white to smoke-gray, or pale grayish sepia, smooth to finely scaled; bulb marginate to marginate-depressed, 7 - 21 mm wide,; context white or streaked with gray, solid or becoming hollow; partial veil membranous, finely striate above, white to sordid white at margin, or very pale gray with fuscous margin; universal veil on bulb as band or rim of pulverulence, dark grayish sepia to fuscous. | ||||||||||||||||||||
| pileipellis | 170 - 220 µm thick, with gelatinized suprapellis and non-gelatinized subpellis. | ||||||||||||||||||||
| basidia | 25 - 36 × 7.5 - 12 µm, usually 4-spored; clamps absent. | ||||||||||||||||||||
| universal veil | On pileus: elements with anticlinal arrangement; filamentous hyphae, abundant, 5 - 10 µm wide, umber; inflated cells abundant, globose to ellipsoid, umber, 16 - 60.5 (-81) × 16 - 53 (-81) µm, single or in short chains. On stipe base: not described. | ||||||||||||||||||||
| lamella edge tissue | inflated cells numerous, 17 - 61 (-86) × 9 - 27 (-53) µm, sphaeropedunculate, clavate, hyaline. | ||||||||||||||||||||
| basidiospores | From protolog (Ridley 1991): [223/21/-] 6.5 - 9 × 5.5 - 6.5 (-8) µm, (Q = (1.0-) 1.50 - 1.54; Q' = 1.32), hyaline, amyloid, occasionally globose, usually broadly ellipsoid to ellipsoid; apiculus not described; contents; not described; white in deposit. | ||||||||||||||||||||
| ecology | From protolog (Ridley 1991): Solitary to subgregarious. Under Nothofagus fusca, N. menziesii, N. solandri var. solandri, N. truncata, Leptospermum scoparium and Kunzea ericoides. Known from the North Island, and the Nelson region of the South Island of New Zealand. | ||||||||||||||||||||
| material examined | From protolog (Ridley 1991): NEW ZEALAND: AUCKLAND—Auckland City, Birkenhead, Kauri Pk., 30.v.1971 J. P. Croxall (paratype, PDD 29050). WELLINGTON—Rimutaka For. Pk., Orongorongo Track, 25.iii.1987 G. S. Ridley 323 (holotype, PDD 56192), 1.iv.1987 G. S. Ridley 360 (paratype, PDD 56191); Orongorongo Valley, Paua Ridge, 18.iii.1987 G. S. Ridley 318 (paratype, PDD 56190); Wellington City, Botanical Gardens, 1.vii.1949 G. Stevenson 695 (paratype, K). NELSON—Karamea, Granite Stream, 12.v.1971 R. F. R. McNabb (paratype, PDD 31205). | ||||||||||||||||||||
| discussion | fFrom protolog (Ridley 1991): Amanita karea is superficially similar to some individuals of A. nothofagi, but distinct microscopically. This superficial similarity has contributed to the uncertainty surrounding A. nothofagi, as many specimens of A. karea have been misidentified as A. nothofagi. Amanita karea with a non-appendiculate pileus, marginate to marginate-depressed bulbous base with a rim of pulverulent volva material, membranous annulus, and ellipsoid basidiospores ...[is assignable to—ed.]... section Validae. | ||||||||||||||||||||
| citations | —R. E. Tulloss | ||||||||||||||||||||
| editors | RET | ||||||||||||||||||||
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