Botanische Staatssammlung München © 1995–2008
Data remain intellectual property of the data set authors.

Usnea fragilescens Hav. ex Lynge

Data Set Maintenance: Data set standard item. Data set author(s): Clerc, P. (97-02-15). Data set to be published after submission; 97-02-15.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: species. Usnea. Parmeliaceae Zenker (1827).

Biogeography: Continent: Europe and Northern America.

Ecology: Corticolous; substrate non-calciferous.

Thallus: Anisotomic-dichotomous; erect or subpendulous, branches tapered; terete or applanate (moderately flattened); not segmented or segmented. Secondary Thallus: Trunk with intact wall, black. Thallus Size and Differentiation: 3-6 cm long; main branches basally constricted. Thallus Outline: Margin entire. Upper Surface: Matt; not fissurate or fissurate; fissures without extrusions; not foveate; without patches; not pseudocyphellate; cilia slender, laminal; isidiomorphs on immature soralia only or on mature and immature soralia, darker than the thallus; papillae subhemispherical; soralia broad, forming ab initio or eroding from the tip of tubercles, maculiform, prominent, slightly excavated, (10)-12-16-20-(26) per mm², isolated, not confluent with other soralia, emarginate or marginate; not tuberculate.

Medulla: Loose; solid.

Reproduction Strategy: Only known as sterile, asexually reproducing form.

Secondary Metabolites: Stictic acid, constictic acid (when present, as minor compound), and norstictic acid (when present, as minor compound).

(report generated 04.Okt.2007)

In case that additional characters and states are required to be included in this data set, consult the LIAS Instructions to Participants and follow the procedures described there.