Niebla undulata

The World Botanical Associates Web Page
Prepared by Richard W. Spjut
April 2003, Oct. 2005, Sep 2012

Niebla and Vermilacinia (Ramalinaceae) from California and Baja California.  
Spjut, R.W., 1996. ISSN 0833-1475, 208 pp.  
Sida, Botanical Miscellany 14. Botanical Research Institute of Texas, Inc.

 

 

undulata-9785B.jpg (178742 bytes)

Morro Santo Domingo, Spjut 9785, May 1986

undulata-10321.jpg (99510 bytes)

Vicinity of Punta Rocosa
Spjut 10321, Mar 1988

undulata-13023.jpg (53487 bytes)undulata-13023B.jpg (70558 bytes)

Slopes above Puerto Catarina, Spjut & Marin 13023, Apr 1994

 

undulata-12682.jpg (111762 bytes)

Cañon San Vicente, Spjut & Marin 12682, Mar 1993

undulata-10016-isotype.jpg (61260 bytes)

Krutsio Ranch
Spjut 100016, isotype

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SW of El Rosario along road
to Punta San Antonio
Spjut & 12699, Mar 1993

Slopes above Puerto Catarina, Spjut & Marin 13022, Apr 1994

Slopes above Puerto Catarina,
 Spjut & Marin 13023, Apr 1994

Slopes above Puerto Catarina,
 Spjut & Marin 13133, Apr 1994

Slopes above Puerto Catarina, occurring with N. turgida, Spjut & Marin 13014-15, Apr 1994

Just south of Campo Nuevo,
Spjut & Marin 12739, Apr 1993

Pebble slopes S of Puerto Catarina.  Spjut & Marin 13047, 13048.  Apr 1994

 

      Niebla undulata is a lichen often found on pebbles and boulders along beaches and on mesas in the Northern Vizcaíno Desert of Baja California, and also occurs on Santa Cruz Island in California.  It is identified by the lichen substance of divaricatic acid (with triterpenes), by the broad undulating contorted lobes arising from a shorter tubular basal branch, and by the cortical surface appearing smooth and recessed between the ridges.  The cortical ridges are oriented longitudinally near apex, which seems related to the twisted branches.  

     Its closest relative, Niebla podetiaforma, shares the character attributes of divaricatic acid and the small clumps of fistulose branches that arise from a pigmented holdfast, but differs in the  prominently and finely reticulate cortex in which the ridges are transversely oriented, and by the cortical surface appearing more inflated (bulging) between ridges.

     The undulate lobes and aggregate apothecia (when present) of N. undulata are seen in N. sorocarpia, distinguished by the larger thallus in which the tubular basal branches appear longer than the upper contorted branches.  Niebla lobulata, another similar species, differs in having sekikaic acid.

     Niebla undulata is variable in habit as shown above.  The branches may lie on the ground, or they may be erect, or they spread outwards from the base.  They are often irregular in shape, but occasionally appear bladelike as seen above in the image Spjut & Marin 13047