The Hypogymnia Species of North America

Hypogymnia schizidiata

Click on Characteristic name for explanation. Click on image for larger version.

Overview

Synopsis: Schizidiate on appressed to suberect lobes with isotomic dichotomous branching, budding and adventitious branching rare, perforations occasional on lobe tips and lower surface; medulla P-, K-, K+ orange red.
Distribution: Endemic to offshore islands of Baja California (Cedros, Guadalupe) and California (Santa Rosa), rarely n to central coastal Calif. Mexico: Cedros Island (Nash 34257, Marsh 7409, Beauchamp s.n. COLO 62444). United States: California: Santa Rosa Island, Ryan 31429 (ASU).
Habitat: Quercus or Pinus groves or forests
Range: Central and Southern California
Other Diagnostics: Cortex flaking off from both smooth parts and rugose parts; ascospores: ellipsoid, (5.5-)6.5-7 (-8) x (3.5-) 4-5 _m;. Production of asexual propagules is rather variable, but in most specimens the cortex tends flake off from both smooth parts and rugose parts, taking with it the algal layer. The type is not as heavily schizidiate as some specimens, but it is fertile and shows the variation from smooth to rugose lobes. True soredia can be nonexistent to well developed. The species is also unusual in its light brownish lobe cavities. In most specimens it is somewhat variable, having pure white portions, occasional dark brown portions, but the majority of the lobe interiors have a loose mesh of brown hyphae over a white background. This plus the frequently perforate lobe tips separate the species from H. imshaugii.
Substrate Notes: On bark and wood of both hardwoods and conifers, including Juniperus, Pachycormus, Pinus, Quercus, and Simmondsia
Abundance in North America: Rare
Substrate: Typically
Host: Pinus, Quercus, Juniperus, Pachycormus, Simmondsia
On Rock: Never
On Moss/Detritus/Sod: Never
Authority: McCune
References: McCune (2002, 2006)
Synonymy: None
Hypogymnia schizidiata - Habit
Habit

Vegetative Structures

Habit Appressed: Sometimes
Habit Pendulous: Never
Habit Erect to Suberect: Commonly
Size (cm): Mean: 4 SD: 2
Upper Color- White to Greenish Gray: Greenish gray
Upper Surface Brown when Solarized: Blackish or unknown
Dark Mottles: Often present
Black Border: Not visible
Lobes Separated: Separate to centrally subcontiguous
Lobe Outline: Even to +/- nodulose
Upper Surface Texture: Becoming rugose
Branching: Isotomic dichot.
Budding: Absent or rare
Lobe Width (mm): Mean: 2 SD: 0.5
Lobe Tips, Axils, and/or Lower Surface Perforated: Commonly
Lobe Tips Perforated: Perforate
Lower Surface Perforated: Sparsely perforate
Cavernulae: Never
Thallus Texture: Cartilaginous
Medulla: Almost always
Ceiling Color: Brownish to white
Floor Color: Brownish to white
Hypogymnia schizidiata - Habit
Habit
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Hypogymnia schizidiata - Lobes
Lobes
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Hypogymnia schizidiata - Lobes
Lobes
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Hypogymnia schizidiata - Lobes
Lobes
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Hypogymnia schizidiata - Perforate lobe tips
Perforate lobe tips
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Hypogymnia schizidiata - Lobes
Lobes
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Hypogymnia schizidiata - Habit
Habit
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Hypogymnia schizidiata - Habit
Habit
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Reproductive Structures

Soredia: Type 3 +/- 5
   Soredia Texture: Rarely
   Soredia Terminal or Laminal: Rarely
   Soredia Shape Lip-Shaped: Never
   Schizidia: Almost always
   Isidia: None
Lobules: Rare
Apothecia: Rare
Spore Length (µm): Mean: 6.75 SD: 0.625 Max: 8 Min: 5.5
Spore Width (µm): Mean: 4.25 SD: 0.375 Max: 5 Min: 3.5
Pycnidia: Common
Hypogymnia schizidiata - Schizidia
Schizidia
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Hypogymnia schizidiata - Schizidia
Schizidia
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Hypogymnia schizidiata - Schizidia
Schizidia
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Hypogymnia schizidiata - Schizidia
Schizidia
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Chemistry