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The mission of the International Association of Bryologists (IAB), as a society, is to strengthen bryology by encouraging interactions among all persons interested in byophytes.

Thursday, November 10, 2016

A tricostate moss adds to the earliest fossil record of pleurocarpous mosses

"Krassiloviella limbelloides is the second bryophyte described as a result of ongoing studies of the Early Cretaceous Apple Bay flora of Vancouver Island.  Krassiloviella is also the second genus of family Tricostaceae, which provides the oldest unequivocal evidence for the pleurocarpous superorder Hypnanae and a hard minimum age for the group. Revealing aspects of diversity unaccounted for in extant floras, such fossil bryophyte discoveries emphasize the importance of paleontology for efforts aimed at documenting the history of biodiversity

The reference is:
Glenn W. K. Shelton, Ruth A. Stockey,  Gar W. Rothwell, and Alexandru M. F. Tomescu. 
Krassiloviella limbelloides gen. et sp. nov.: Additional Diversity in the Hypnanaean Moss Family Tricostaceae (Valanginian, Vancouver Island, British Columbia).
International Journal of Plant Sciences 177(9): 792-808. 2016.
DOI: 10.1086/688707 

Available from: https://www.researchgate.net/publication/309090129_Krassiloviella_limbelloides_gen_et_sp_nov_Additional_Diversity_in_the_Hypnanaean_Moss_Family_Tricostaceae_Valanginian_Vancouver_Island_British_Columbia [accessed Nov 10, 2016].


Leaves are tricostate, with a unistratose lamina through most of the leaf length (e.g., fi g. 6). Laminae are delicate, as evidenced by their typically incomplete preservation (e.g., fi gs. 4 E ,6,7 C ). Where unistratose, the lamina is 11.5 – 14 m m thick. However, the lamina is bistratose or tristratose in areas where costae converge at the leaf apex ( fi g. 7 A ,7 C ). The three costae arise separately ( fi g. 7 H ,7 I ).

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