Taxonomic history:
   1753: Linnaeus described this species as Bryum pyriforme in Species Plantarum, 1st ed., p. 1116 of Ray Society 1957 facsimile.
   today: The current name for this species is Leptobryum pyriforme (Hedw.) Wilson

original Latin diagnosis
Bryum antheris erectis obovatis, calyptra subulata, surculis acaulibus, foliis ovatis muticis.

English translation
Bryum with anthers [= sporophyte capsules] erect [and] obovate; with the calyptra subulate; with the upright shoots stemless; [and] with leaves ovate [and] without a point.

English translation with commentary

Bryum	Bryum
with anthers [= sporophyte capsules]	antheris - ablative plural of first declension feminine noun anthera, -ae
erect	erectis - ablative plural feminine of perfect passive participle of third conjugation verb erigo, erigere, erexi, erectum; modifies antheris
[and]	[added for smoother reading]
obovate;	obovatis - ablative plural feminine of group A adjective obovatus, -a, -um; modifies antheris
with the calyptra	calyptra - ablative singular of first declension feminine noun calyptra, -ae
subulate;	subulata - ablative singular feminine of group A adjective subulatus, -a, -um; modifies calyptra
with the upright shoota	surculis - ablative plural of second declension masculine noun surculus, -i
stemless;	acaulibus - ablative plural masculine of group B adjective acaulis, -is, -e; modifies surculis
[and]	[added for smoother reading]
with leaves	foliis - ablative plural of second declension neuter noun folium, folii
ovate	ovatis - ablative plural neuter of group A adjective ovatus, -a, -um; modifies foliis
[and]	[added for smoother reading]
without a point.	muticis - ablative plural neuter of group A adjective muticus, -a, -um; modifies foliis