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 Calicioids of Temperate Regions
0.01 (development)
Eric B. Peterson
 

Mycocalicium

This genus is distinguished from Chaenothecopsis by the lack of an apical canal in the ascus tip.  It also can resemble Stenocybe or Phaeocalicium in some cases, but can be easily distinguished by the smaller, simple spores.

Taxa covered (15):

Key to Species

Warning: keys are incomplete.

Validation script believes all taxa are included in the key(s).


  1. 1a. Items to add.
  2. 1b. Capitulum brownish.
    1. 3a. Mazaedium itself brown, K+green, on exudate.Mycocalicium chaudhari
    2. 3b. Mazaedium black with a brown excipulum.
      1. 4a. Excipulum with brown pruina, K+R, spore wall exceptionally thick.Mycocalicium fulvofuscum
      2. 4b. Excipulum brownish black (pruina?), K ?, spore wall probably not as above. {need to find good references for this].Mycocalicium rappii
  3. 1c. Capitulum black, epruinose or with a white or yellowish green pruina, never brown.
    1. 5a. Capitulum with a yellowish green pruina.
      1. 6a. Stalks growing from a black pseudostroma over exudate on scarred trees of Sequoiadendron or Sequoia.Mycocalicium sequoiae
      2. 6b. Growing on lignum.Mycocalicium calicioides
    2. 5b. Capitulum with a white pruina or epruinose.
      1. 7a. Excipulum with a strongly incurved margin.
        1. 8a. Thallus present, granulose, greenish-grey.Mycocalicium ravenelii
        2. 8b. Thallus absent.
          1. 9a. Margin of excipulum strongly thickened.Mycocalicium americanum
          2. 9b. Margin of excipulum not strongly thickened.Mycocalicium subtile
      2. 7b. Excipulum without a strongly incurved margin.
        1. 10a. Spores often exceeding 10μm in length.
          1. 11a. Excipulum white pruinose, apothecia small, thallus not visible.Mycocalicium fuscipes
          2. 11b. Excipulum epruinose, thallus granulose, greenish grey.Mycocalicium ravenelii
        2. 10b. Spores not exceeding 10μm in length.
          1. 12a. Central part of stalk hyaline.
            1. 13a. Spores 8-9 um, K+ intensified reddish.Mycocalicium victoriae
            2. 13b. Spores 6-7 um, K-.Mycocalicium anomalum
          2. 12b. Central part of stalk dark greenish to dark brownish, though possibly more pale than outer part of stalk, spores 5.5-10μm.
            1. 14a. Excipulum at the base with large (8-13μm), thin-walled +/- isodiametric cells.
              1. 15a. Cells isodiametric, 8-13μm in diameter.Mycocalicium albonigrum
              2. 15b. Cells isodiametric to slightly elongate, 15-20 X 20μm.Mycocalicium reticulatum
            2. 14b. Excipulum at the base consisting of periclinally arranged, sclerotized hyphae or a pserudoparenchymatic tissue consisting of rather small (4-6μm) cylindrical or isodiametric cells with thickened walls.
              1. 16a. Spores allantoid, 5.5-9μm long.Mycocalicium subtile
              2. 16b. Spores oblong-ellipsoidal, 6.5-10μm.Mycocalicium rappii
Step number 1 has 3 options!
Step number 2 has 4 options!

Species Details

Mycocalicium "mazaedia"
ID=237
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Mycocalicium sp. nov. SCL16925 Mycocalicium sp. nov. from "Imperatrice" near Ashland, OR. Pruinosity on excipulum is variable; many ascomata lack pruina. Scot Loring # SCL16925. Ca. 9x.
Mycocalicium sp. nov. SCL16925 Ascospores. Scot Loring # SCL16925. 400x
Mycocalicium sp. nov. SCL16925 Ascospores with a hint of a longitudinal ornamentation. Scot Loring # SCL16925. 1000x
Mycocalicium sp. nov. SCL16925 Ascus with thickened tip (typical of genus Mycocalicium). Scot Loring # SCL16925. 1000x with Methylene Blue.
Mycocalicium sp. nov. SCL16925 Reticulate pattern of cell walls of excipulum. Scot Loring # SCL16925. 400x
Mycocaliciium sp. Stacked macrophotography. EBP#5092.
Mycocalicium sp. Stacked macrophotography. EBP#5093.
Mycocalicium sp. Spores and ascus tip.  Spores photographed at 1000x.  Note ornamentation visible on some.

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Found by Scot Loring at "Imperatrice" near Ashland, OR, specimen number SCL16925.
External Information: References: .
Mycocalicium albonigrum (Nyl.) Fink
ID=139
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Mycocalicium albonigrum Nearly isodiametric, thin-walled cells in the excipulum of M. albonigrum.  These can be very difficult to see in squash mounts - I totally lucked out with how this one spread itself out! EBP#4983 collected January, 2019, on CALS foray to Quail Ridge Reserve.

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Mycocalicium americanum (R. Sant.) Tibell
ID=140
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Mycocalicium anomalum Tibell
ID=141
Type(s): -1998
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Mycocalicium calicioides (N?dv.) Tibell
ID=142
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Mycocalicium chaudhari Tewari & Pant
ID=144
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Mycocalicium fulvofuscum (F. Wilson ex Bailey) Tibell
ID=146
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Mycocalicium fuscipes (Tuck.) Fink
ID=145
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Mycocalicium llimonae Hladun & Mu?iz
ID=147
Type(s): Mu?iz & Hladun 2007
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Mycocalicium rapax Tibell
ID=238
Type(s): Tibell (2001)
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External Information: References: Tibell 2001.
Mycocalicium ravenelii (Tuck.) Fink
ID=148
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Mycocalicium reticulatum N?dv.
ID=149
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Mycocalicium sequoiae Bonar
ID=150
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Habitat of Mycocalicium sequoiae California Lichen Society members Boyd Poulsen and Bill Hill point to typical habitat.
Mycocalicium sequoiae
Mycocalicium sequoiae.
Mycocalicium sequoiae.
Mycocalicium sequoiae. Ascospores photographed at 100x (oil imersion) with Phase Contrast.  Note hint of bilocular appearence; indicative that a septum may be forming.
Mycocalicium sequoiae. Ascospores photographed at 100x (oil imersion) with Phase Contrast.  Note hint of bilocular appearence; indicative that a septum may be forming.

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Mycocalicium subtile (Pers.) Szatala
ID=151
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Mycocalicium subtile
Mycocalicium subtile
Mycocalicium subtile Excipular hyphae are linear and of uniform diameter. Compare with M. albonigrum and M. reticulatum.
Mycocalicium subtile In Mycocalicium, the ascus tip lacks a central canal, ending rather squarred-off on the interior.  Compare with Chaenothecopsis nana.
Mycocalicium subtile ascomata. Most specimens have ascomata that are shining pure-black, but sometimes there is a waxy (glaucous) apperance to the excipulum (exceptionally well developed in this specimen). Scot Loring, SCL16959, On Juniperous occidentalis by large cliffs in full sun.

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Mycocalicium victoriae (C. Knight & F. Wilson) N?dv.
ID=152
Type(s): (Tibell 2007)
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Mycocalicium victoriae? EBP#5095. On wood of Quercus garryana near Ashland, Oregon.
Mycocalicium victoriae? EBP#5095. On wood of Quercus garryana near Ashland, Oregon. Young ascomata appear to have an excipulum with a constricted margin, but it is not thick like in M. americana and it opens up with age.
Mycocalicium victoriae? EBP#5095. On wood of Quercus garryana near Ashland, Oregon.
Mycocalicium victoriae? EBP#5095. On wood of Quercus garryana near Ashland, Oregon.

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Count of taxa = 15
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