Taxon Report
Sulcaria isidiifera Brodosplitting yarn lichen |
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Taxon Summary
Sulcaria isidiifera, commonly known as splitting yarn lichen, is a fruticose lichen (epiphytic) in the Alectoriaceae that is found only in California. It occurs within Coastal scrub, growing at elevations from 20 to 30 meters. Sulcaria isidiifera is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Sulcaria isidiifera Brodo |
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Common Name: |
splitting yarn lichen |
| Family: | Alectoriaceae |
| Element Code: | NLTEST0020 |
| USDA Plants Symbol: | SUIS |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | fruticose lichen (epiphytic) |
| Blooming Period: | |
| Elevation: | 20-30 (65-100) |
| General Habitats: | Coastal scrub |
| Microhabitat: | |
| Microhabitat Details: | On branches of oaks and shrubs |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 6 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 5 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Luis Obispo (SLO) | |
| Quads: Name (Quad Code) | |
| Morro Bay South (3512037) | |
Threat List Data from the CNDDB
| Threat List Total: | 4 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 33 % | |
| Development | 2 | 33% |
| Over-collecting/poaching | 2 | 33% |
| Improper burning regime | 1 | 16% |
| Other | 1 | 16% |
Notes
| See Bulletin of the California Lichen Society 14(2):45-47 (2007) for CALS Conservation Committee sponsorship. |
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Threats: |
| Threatened by coastal development, alteration of fire regimes, and over-collecting. Portions of populations have been extirpated due to historical residential development. |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 18 November 2025].