A Guide to the Study of Lichens
A Guide to the Study of Lichens
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This genus has also been included under Heterothe- cium. Its general characters are like those of Gatil- laria; the apothecia are somewhat larger and the disk more convex. The thallus presents almost the same external appearance as to color and general con- formation ; the algae are, however, Protococcus instead of Pleicrococcus. The hypothecium is black or blue- black. Each spore-sac contains one, rarely two, large simple spores. The spore-wall consists of two layers, of which the outer one is... quite thick and gelatin- ous.
1. Megalospora sanguinaria. Thallus light-gray. Apothecia comparatively large. Disk convex. Spores large, simple, colorless, outer spore-wall (exosporium) thick, 103^ X 4:0/x.
The above is the only species which came to my no- tice. It is not very common and occurs upon trees. It seems to be northern in its range.
12. Lopadium.
This genus is also taken from the conglomerate group Heterothecium. The thallus is crustose and uni- formly spreading. The algae are Chroolepus umhrina.
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To quickly assess the difficulty of the text, read a short excerpt:
This genus has also been included under Heterothe- cium. Its general characters are like those of Gatil- laria; the apothecia are somewhat larger and the disk more convex. The thallus presents almost the same external appearance as to color and general con- formation ; the algae are, however, Protococcus instead of Pleicrococcus. The hypothecium is black or blue- black. Each spore-sac contains one, rarely two, large simple spores. The spore-wall consists of two layers, of which the outer one is... quite thick and gelatin- ous.
1. Megalospora sanguinaria. Thallus light-gray. Apothecia comparatively large. Disk convex. Spores large, simple, colorless, outer spore-wall (exosporium) thick, 103^ X 4:0/x.
The above is the only species which came to my no- tice. It is not very common and occurs upon trees. It seems to be northern in its range.
12. Lopadium.
This genus is also taken from the conglomerate group Heterothecium. The thallus is crustose and uni- formly spreading. The algae are Chroolepus umhrina.
What to read after A Guide to the Study of Lichens?
You can find similar books in the "Read Also" column, or choose other free books by Albert Schneider to read onlineMoreLess
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