Coleosporium asterum (Dietel) Syd. & P. Syd. 1914

Foodplant / parasite
Coleosporium asterum parasitises live Solidago

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus nigra ssp. nigra

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus thunbergii

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus contorta

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus mugo

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus rigida

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus ponderosa

Foodplant / parasite
aecium of Coleosporium asterum parasitises live Pinus sylvestris

Foodplant / parasite
Coleosporium asterum parasitises live x Solidaster

Coleosporium solidaginis (Schw.) Thiim. Bull. Torrey Club
6: 216. 1878.
[/redo Solidaginis Schw. Schr. Nat. Ges. Leipzig 1 : 70. 1822.
Caeoma {Uredo) Solidaginis Schw. Trans. Am. Phil. Soc. II. 4 : 291. 1832.
Peridermium acicolum Underw. & Earle, Bull. Torrey Club 23: 400. 1896.
Stichopsora Asterum Dietel, Bot. Jahrb. 28 : 565. 1899.
Stichopsora Solidaginis Dietel, Hedwigia Beibl. 42 : 181. 1903. Pycnia amphigenous, scattered, numerous, originating between mesophyl and cortical layer, noticeable, 0.3-0.5 mm. wide by 0.5-0.8 mm. long, dehiscent by a longitudinal slit, low-conoidal, 80-i00// high.
Aecia from a limited mycelium, amphigenous, numerous, scattered on discolored spots occupying part of a leaf, erumpent from longitudinal slits, tongue-shaped, 0.5-1 mm. long by 0.5-0.7 mm. high ; peridium rupturing irregularly, moderately firm, white, cells overlapping, 35-45 fi long, not much narrower, walls transversely striate, inner coarsely verrucose, thick, 5-6//, outer less rough and somewhat thinner; aeciospores ellipsoid, 20-25 by 28-40 //; wall colorless, closely and coarsely verrucose with deciduous tubercles, which are directed away from a smooth spot extending up one side, thick, 2-3 i on the smooth spot,
increasing to 5-6/" on the opposite side, including the tubercles.
On Pinaceae :
Pinus rigida Mill., Connecticut, Massachusetts, New Jersey, New York.
Uredinia hypophyllous, rarely also epiphyllous, irregulariy scattered, or at first somewhat gregarious and crowded, 0.3-0.5 mm. across, soon naked, yellow or orangeyellow, ruptured epidermis inconspicuous; urediniospores ellipsoid or globoid, 17-22 by 20-30 /i; wall rather thin, 1-2 //, closely and strongly verrucose ; contents orange-yellow when fresh, fading to colorless,

Coleosporium asterum is a species of rust fungus in the family Coleosporiaceae. It infects species in the Asteraceae family, such as those in genus Aster and Solidago, as well as the needle pines Pinus contorta and P. banksiana. It has been recorded on aster family species Canadanthus modestus, Eurybia conspicua, Solidago missouriensis, Symphyotrichum ciliolatum, S. laeve, and numerous others.

The basionym of Coleosporium asterum is Stichopsora asterum, and the fungus originally was found in 1898 on leaves of the Asteraceae species Callistephus chinensis, Aster scaber (now Doellingeria scabra), and Aster tataricus on the island of Honshu, Japan.