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Dicke, Robert J. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XLIV (1955)

Greene, H. C.
Notes on Wisconsin parasitic fungi. XXI,   pp. 29-43 ff. PDF (5.6 MB)


Page 31

  311955] Greene—Wisconsin Parasitic Fungi. XXI 
bose, about 16O—175~~ diam., with conidia hyaline, short-cylindric,
5—7 x 2.5—3~. 4) On hex verticillata (cult.). Dane Co.,
Madison,
August 28. The conidia are 5—6 x 2~, the pycnidia about 125k diam.,
of the dimensions of P. haynaldi Roum., but the spots are not as well defined
as those in European specimens on hex opaca. 5) On Amsonia trabernaemontana
(cult.). Dane Co., Madison, July 7. The lesions are tan and elongate, following
the leaf midribs. The pycnidia are pale olivaceous by transmitted light,
subglobose, about 125~~ diam. The conidia are hyaline, with a faint greenish
cast, short-cylindric, 4—7 x 3—4g. 6) On Solidago flexicaulis
(latifolia). Lafayette Co., near Fayette, August 25. This fungus is characterized
by spores that approach those of a Septoria. The large, conspicuous spots
are deep brown, faintly zonate, with a yellowish halo surrounding them, orbicular,
1—1.5 cm. diam. The scattered pycnidia are smoky-brown, subglobose,
with those measured running from about 165—200~~ diam. The conidia
are hyaline, rod-shaped, straight or very slightly curved, biguttulate with
a tiny shining droplet at each end of the conidium, 7—10 x 1.5/L.
 ASTEROMELLA (?) sp. was destructively parasitic on leaves of Toe fleidia
glutinosa at Madison, August 25. The small, nonostiolate, shining-black,
globose fruiting bodies (or sclerotia?) are about 35—55,~ ' diam.,
clustered, and connected by strands of dark, dendritically arranged mycelium,
which permeates the leaf and resulted in total killing back from the tip.
Conidia were not produced, so far as observed. 
 PHoMoPsIs (?) sp. on Cannabis sativa. Dane Co., near Mazomanie, August 25,
and in Green Co. at Brodhead, September 1. Descriptive notes: Lesions very
striking, conspicuous ashen areas on living leaflets, tending to run from
margin to midrib, variable in length and width, but in general somewhat rounded
or orbicular, with the pycnidia arranged in concentric rings easily visible
to the naked eye. Pycnidia black, strongly developed above, less perfectly
so in the leaf tissue below, flattened in the lower portion, sometimes confluent,
ostiolate, 80—200~ in long diam. Conidiophores very short and inconspicuous,
lining the pycnidial cavity. Conidia hyaline, often guttulate, subcylindric
to subfusoid, 5—8 x 2.5—3.5~. Scolecospores not observed.
 It is difficult to see how this striking fungus, if it is at all common
and widespread, has hitherto escaped mycologists' notice, but I find nothing
reported on Cannabis which seems even suggestive. Phyilosticta cannabis (Kirchn.)
Speg., already reported from Wisconsin and in addition represented in our
herbarium by an authentic European specimen, is quite different and much
less well marked. 


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