Calliergon orbicularicordatum

(Renauld & Cardot) Brotherus in H. G. A. Engler and K. Prantl

in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 231[I,3]: 1037. 1909.

Endemic
Basionym: Hypnum orbicularicordatum Renauld & Cardot Bull. Herb. Boissier 4: 19. 1896
Treatment appears in FNA Volume 28. Treatment on page 392. Mentioned on page 391.

Plants medium-sized to large, brownish yellow. Stems unbranched or sparsely branched (few shoots seen); axillary hair apical cell elongate-rectangular to short-linear. Stem-leaves broadly ovate or broadly ovate-cordate; costa single, 90–109 µm wide near base, ending shortly below apex; alar regions indistinctly delimited, broadly oblong to transversely triangular, from margins 65–80% distance to costa; proximal laminal cells to 2 times as wide as distal cells; medial cells to 18 (–20) µm wide proximally, 40–126 × 7–12 (–14) µm in distal 1/3–1/2. Sexual condition unknown. Spores unknown.


Habitat: Habitat unknown
Elevation: elevation unknown

Discussion

It is unclear whether Calliergon orbicularicordatum is an expression of another Calliergon species from unfavorable conditions or if it should be recognized as a distinct species. K. Karczmarz (1971) reported C. orbicularicordatum from Alaska, Greenland, and Svalbard, but the features he used to distinguish this taxon are unclear.

Selected References

None.

Lower Taxa

None.
not separating +
obtuse +, rounded +  and acuminate or cleft +
elongate-rectangular;short-linear +
Lars Hedenäs +
(Renauld & Cardot) Brotherus in H. G. A. Engler and K. Prantl +
curved +  and straight +
decurrent +
Hypnum orbicularicordatum +
cucullate +
cylindric +
inflated +, rectangular +  and long-rectangular +
differentiated +
90um;109um +
Nunavut. +
elevation unknown +
brownish +  and yellowbrown +
Habitat unknown +
sinuate +  and entire +
autoicous +, dioicous +  and sexual +
obovate +, oblong +, ovate +  and lanceolate +
in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. +
broadly oblong +  and transversely triangular +
ovate-cordate;ovate +
branched +  and unbranched +
Calliergon orbicularicordatum +
Calliergon +
species +
medium-sized +  and large +
transitional +