Polyblastia helvetica Th. Fr.
Bot. Not.: 112, 1865.
Synonyms: Amphoroblastia helvetica (Th. Fr.) Servít
Distribution: N - Frl, Ven (TSB 15382), Lomb (Nascimbene 2006).
Description: Thallus crustose, episubstratic, thin and film-like to finely granular, subgelatinous when wet, pale to blackish grey, often inconspicuous. Perithecia black, 0.3-0.5 mm across, more or less immersed, globose or slightly flattened at the top. Involucrellum absent; exciple dark in upper part, pale brown in lower part; hamathecium of periphyses and periphysoids, interascal filaments absent. Asci (1-)2-spored, clavate, K/I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum. Ascospores strongly muriform, dark brown, cylindrical-ellipsoid, 70-150 x 30-60 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.Note: on more or less calciferous soil, often amongst bryophytes, with optimum near treeline; restricted to the Alps in Italy. A species of unclear affinities, which does not belong to Polyblastia s.str.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: very rare
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent
![](map_builder/1803.png)
Predictive model
Herbarium samples
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011781.jpg)
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Polyblastia_helvetica.htm
France, 25/8/2017 - Thoiry - Ain
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011787.jpg)
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Polyblastia_helvetica.htm
France, 25/8/2017 - Thoiry - Ain
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011792.jpg)
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Polyblastia_helvetica.htm
France, 25/8/2017 - Thoiry - Ain
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: very rare
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent
![](map_builder/1803.png)
Predictive model
Herbarium samples |
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011781.jpg)
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Polyblastia_helvetica.htm
France, 25/8/2017 - Thoiry - Ain
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011787.jpg)
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Polyblastia_helvetica.htm
France, 25/8/2017 - Thoiry - Ain
![](../flora/images/species/thumbnails/PolyblastiahelveticaThFr1673011792.jpg)